If you sent a lone modern tank like a Abrams, Leopard, or black panther back to WW2 with a continuous supply of spare parts, ammo, fuel etc. Would it make a difference?

I know a lone modern fighter jet would make a huge difference but have always wondered about a tank

Interesting question.

I think not, on the grand scale. Whilst yes, it would vastly outclass other tanks, you’re forgetting about the adaptability and inventiveness of humans. I believe they would find a way to disable it fairly quickly - after all, WW2 was a constant stream of one fighting unit encountering new technology - Allies had nothing like the German Railgun for example, but it had little influence in the outcome. Also, like the Tirpiz, something like this could become a liability. It would become such a target that it would tie up a huge amount of resources protecting it. Modern tanks are still vulnerable in many ways - even from as simple a thing as just digging a hole in the ground and covering it with branches caveman style.