I am sure that there is absolutely no difference in how Ukraine employed, equipped, motivated and supplied their conscript forces, compared to how Russia is opting to do this.
Fighting in a familiar area, amongst familiar physical, urban and human terrain confers no advantages, nor does being able to draw supplies from your immediate surroundings.
Plus, there is absolutely no way in hell that someone who is defending their homes from an immediate invasion might be more motivated to fight than someone who has been dragged off of the street, put in an old uniform, given the most rudimentary training and sent to fight without basic supplies, in a war they probably want nothing to do with.
You're right, it's totally conginitive dissonance to see there being differing outcomes from mobilisation of forces in two different countries, with their own specific contexts. It's exactly the same, and on paper that means Russia is in for a big win, just like when they took Kyiv in a matter of days...
I'm sure when you plonk some untrained middle aged men on the front line, to bolster an army that was already struggling with logistics and equipment shortages, they are going to be a very effective force. They are totally going to fight to the last man, when they've not been resupplied for three days, don't have any warm kit for the winter and the Ukrainians have offered them the chance to surrender.