Yes mine are stock IM running the smaller of the 2 all the way around.I believe on the stock the backs are a bit wider on the rears so I went thinner all the way around.
I would run wider in the rear .if you run the same size all the way around you have nothing for the rear tires to really grab onto.i have 26" outlaws on my rhino I run 10" wide in the front and 12"wide in the rear that way my rear tires have something to grab onto rather than just trying to make it through a rut that the front tires just dug out.