I do not say it is chemically different. I'm saying the tee does not taste the same!
You cannot reduce the whole gustative experience to simply chemically composition but there IS something different.
Maybe not if I'm among tester.
I take feel the difference between microwave and other heating method not just in tea. I know people you feel the difference between gaz and electricity even though I don't.
Believe it or not, but most people overestimate their abilities.
And when heating up food you wouldn't be able to tell either, unless the food was slightly burned at say bottom (getting a slight crust for example).
If you just take out portioned food from the middle and mix it up, you again wouldn't be able to tell.