Like stated before, the spare should be fine when used as intended, no matter what size. It's supposed to be an emergency spare, I have a full(correct)sized spare because if I'm off-road and get a flat I want to be able to put the exact tire back on and get out of the woods. You should be fine though.

 

Ur spare will be fine as long as you don't use 4wheel drive, the different size tire could really mesh up sum gears n axels if u do