I doubt that the wheels would be the same bolt pattern to begin with as every one I've worked around figuring the sizes rolling circumference out on when it came to wheels was different.
It may be possible though to put larger tires on your current wheels but I wouldn't know that for sure without knowing what's on it now, type of tread etc. If you could find someone that has what you're thinking might work then measure the wheels to see if they're the same bolt pattern or not, then do the math on the tires you're currently running then the bigger tires to determine IF the ratio remains the same so you don't break the tractor.
Al