FightCade 2 has been adding a bunch of different hacks to their game list for people to play. One of them being "Streets Of Rage 2 Street Fighter Versions 1 - 4", and surprisingly, they're done semi-well
Version 1 - Dhalsim, Ryu, Guile, Ken
Version 2 - Cammy, DeeJay, ChunLi, FeiLong
Version 3 - Blanka, Honda, Zangief, T.Hawk
Version 4 - Boxer, Dictator, Sagat, Claw
The characters aren't just simple sprite swaps of the OG 4 SOR2 cast, they have their own unique attacks copied from the SF2 games. The reason why I said these hacks are done "semi-well" is because you can clearly tell some characters got more love and attention while others were just an after thought. Characters like FeiLong, Boxer, Dictator, and Cammy are fun as fuck to use. Version 3 however is the weakest version. Some of their special attacks are just normal moves (Zangief's HP, T.Hawk's MK, etc...), which is upsetting for someone like me who mains Zangief and Honda in actual SF2.
Can't seem to find a link for these other than YouTube videos that don't have any sources themselves in the description (and won't even say where they got the rom from in the comments section). May have been just one-and-done hacks, but if not, I'm hoping they get improved upon because there is MAJOR potential in these hacks.