The difference is whether or not it is vulnerable to conventional anti-tank weapons.
We just sent the Ukrainians a bunch of M777 155mm howitzers. Whatever the tank’s got going for it, I doubt it’s artillery-proof.
All Russian tanks except possibly the prototype T-14 have the same auto-loader ammo placement that makes them vulnerable. There is no way to judge what took the tank out. Most are taken out by artillery fire. UA also uses buggies with ATMs mounted to harass rear areas.