They've already had almost a decade of NATO-style doctrine, thanks to the military reforms that followed the Crimean invasion. On top of which, a lot of the crews for these new tanks are fresh recruits, being trained without any preconceptions or prior doctrinal influence. It's not a perfect change, of course; they're still part of a military that is heavily influenced by soviet-era thinking and culture, but they're on a very different path to the Russian military.
Who are, let us not forget, allegedly dragging out 60s-era military reserves to replace their lost equipment. If that's really the case, then they're not even an era-peer of the tanks they'll be facing. The Leopard 1s Ukraine is receiving are refits from the 1980s.