Rim interchangeability?

Are some rims interchangeable? I don't mean can I put a tire made for a 1.85x19 on a 2.15x19. What I mean is, if I were to grab an OEM Suzuki rim that was 2.15x19, could I put it on my 2009 Te250, which comes with an OEM rim thats 2.15x18? If I can't, can I even put a 2.15x19 on my Te250?

Oh, and is there any way to take the headlight off of my bike and put in a flat mx-style panel? I ask because I don't want to get sand in it or screw it up.

You could put the suzuki rim on but you would need custom spokes to match the 2 different patterns. You would probably also need to lace the wheel in a different pattern. You could put a husky oem rim on with a set of husky spokes for a 19", just a matter of changing parts. I did the opposite, I changed from a 19" to a 18". You can change from a headlight to a number plate, you need the numberplate brackets and the numberplare and you are good to go. Send me a PM if you need more details of info.