Pretty much every alien Disney ends up using from the old media ends up looking like a mutilated version of the original. Here's their take on the Arcona with the original Arcona next to it for comparison where its now a wild funny animal rather than alien which kinda fits with Kennedy, Matt Martin and nu-Lucasfilm's view on aliens as being nothing more than comedic relief and pets.
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The original art called it an Arcona night watcher. But later Pablo Hidalgo (who has a severe case of tism when it comes to names) had that retconned for the Forces of Destiny cartoon in which it became a gigantic Jakku sandworm with a tiny head and was renamed
Night Watcher Worm to keep things consistent with Filoni Wars' depiction of an Arcona. This one however is something I'm not sure that can be pinned on Jake since most of its backstory comes from JJ and a european sculptor, although its possible Jake did the basic design sketch since that's his job. Filoni would later re-canonize original arconans in his Resistance cartoons, but even that's a matter of debate since he tried recanonizing Bothans with it but Matt Martin shot those down.
Jake also
brought in his daughter to help him took a drawing his daughter made 3 years before Solo and used it to "update" the Gand (the species of Zuckuss the bounty hunter from ESB) for Solo. What they ended up doing to "improve" it was by giving it slingshot ears. Here's some comparison pics.
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Hidalgo would later rename it from a Gand to a Malbu due his own consistency tism. While initially a nameless nu-Gand though, the individual seen in the pic would later on be named after Jake's daughter Eloïse Aurora Mae, with the nu-Gand individual now be called Auromae Iselo.
Jake was also told to design more EU aliens for Solo (although he did a few before for RO) and much like with OT and PT aliens, they really don't look like their original counterparts at all. For example, the Coway which instead now look more like the
Utai midgets from Revenge of the Sith.
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The most notable change for though were the Pykes from Filoni Wars which were bug-headed dudes. Below are some pictures for comparison:
A Pyke as depicted in Filoni Wars.
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A realistic Pyke as depicted in unused concept art from 2007 (looks better than how it appeared in Filoni Wars).
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And a "realistic" Pyke as depicted by Jake Lunt Davies for Solo with a drastically different head and body and nothing in common with the last two other than the two "chin nostrils" which are just breathing devices rather than organic. And according to its official bio, its not a cyborg, that's just a mucus filled suit.
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Strangely, the
first sketch he made for it looked more organic yet he didn't want to use it.
Only aliens he didn't significantly change were Ackbar and Nien Nub (due to being characters) and also Rodians but he's only ever made one and you hardly see it in Solo.
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Also of note is that aside from his Rodian being orange/brown (despite Rodians being stated in both old and nu-canon to only be green, black and blue) and not having sparkly eyes, this is supposedly a female Rodian. The original sketches were said to barely look like a Rodian and were rejected. Although I'm looking through
one of them now and she actually looks more like a female Rodian with starry eyes and traditional hair than the final design albeit she's still orange and his commentary about her seems dispassionate and indifferent, which just seems to raise further questions.
Edit: As an added bonus, here's how Jake wanted Maul to look like in Solo. He barely even looked like himself or a Zabrak.

It was surprisingly rejected. Thing doesn't even have feet or protective plating.
Second Edit:
Never mind. It seems Jake just doesn't think too fondly of the old aliens.
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However, in a
another post he mentions something interesting, in that he makes a lot of alien designs but the majority get rejected, including the Rodian girl's first one and the initial Pyke. Which again makes me suspect that what I said before about how its probably a combination of artistic arrogance and Lucasfilm refusing to use old stuff (nor make aliens look like believable people) being the main cause of the loss of old aliens. I'm just curious who is the one approving these awful aliens then. Neal Scanlan or Kennedy herself?
And I just found out that he created the titty sirens too.
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The inside of the ride looks more like the OT than the rest of the park. All they would need to do is replace the nu-trooper helmets with original ones, switch Kylo Ren's outfit with Vader's and repaint the FO Tie-Figther to be gray rather than red and black. The challenge though might the waiting line since supposedly they wasted a ton of money on creating a realistic Rey hologram. But they could still replace it with Ackbar if they're done insulting Tim Rose.
Also agreed on the speeder thing. A chainsaw tread would at least be a suitable ramming vehicle.