If it is four wheel drive yes it will be problem. The tire sizes are matched to the gear ratios of the front and rear drive lines so that they work in sync. If you put larger front tires than stock they will try to make you go faster than the rear tires will which means either the fronts or rears are going to be constantly slipping. I would not recommend it
It is 4wd, and I thought about that, but what makes me wonder is that you can get different sized rear tires as an option, with the same size fronts.
If the front of the tractor is raised higher than the rear. The tractor will be rolling uphill and will therefore use extra fuel.
Are you sure the front tires would be the same size?
The tire options (for MFWD machines) on the Deere site indicate specific tire sizes (depending on the type of tire) for their tractors.
You could check with a dealer...but I do think you'd cause drive train problems.
Since you have both tractor there now, why not measure the rolling distance on both fronts and verify that they are the same or nearly same. They may be wider but no difference in OD. If they are the same, you could even swap them out between the tractorsYeah, you can also get the rears in 17.5Lx24, which are wider but slightly shorter than the stock 14.9x24. But the front tire size remains the same.