T-90AM vs Oplot test
We can't read too much into a single test but it shows the two tanks are roughly equal in a shootout, this single T-90 (bott left) was the last tank left standing but it was a close run thing. (the non-burning T-90 is knocked out)
I lined up two groups of 5 tanks facing each other at 700 metres and left them to start shooting. There was lots of smoke popping and the gunfight ran to about 6 turns. Both tanks have APS but of course it played no part because incoming high-velocity solid AP shots don't trigger it-
So it seems Ukrainian vs Russian forces is the way to go to get a balanced game, and incidentally Ukraine doesn't have Javelins..:)