The character <> world relationship in this game is very surprising. It seems to be completely accepted to have 1 given character explore many different worlds. I'm not sure why the devs didn't decide to tie a character to a single specific world. It may be an escape hatch in case of really bad seed, or a conscious gameplay decision.

In any case, I would consider this cheating yes. We know that the impossibility of teleporting ores is very conscious and intentional. That being said, you do you :)