New 1000 xp4 need tire help on stock rims

Just bought my first Rzr 1000 4. Like the stock wheels. When I wear out the bighorn tires I might want to try something different. had a couple questions.

1. how do i fit 4 30x10x14 tires like mongrels on my stock rims (stock bighorns are 29x11x14 rear and 29x9x14 front). will the 30x10x14 fit on both the front and back rims? Will they shape different with the different rim sizes like get wide and short on rear?

2: will i need to do any clutching or anything if I change to a 30x10x14 tire?