Bears

Ok I have a 07 screw with stock rims and tires (255/65r17) I was wondering if i can get the stock rims and tires from the newer f150's (265/60r18) without having to use spacers or mess with flashing computer for wheel size. The wheels have the same width and offset so i don't think i should have any problems but i am not certain. I read on here that somebody tried to go from the newer ones to the older ones and couldn't, so that got me thinking. Can anybody help out?