HOW HARD IS IT TO SWITCH FROM A KAWASAKI TO A KOHLER ON A SCAG ZERO TURN???

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Need to replace my 31hp Kawasaki on a 60 scag cheetah. Would like to switch to a Kohler since Kawasaki will not replace a motor that blew a hole in the side even though it is still under warranty. (not a manufacturer defect is what they said) Been using zero turns since 99, change oil weekly, check oil daily, and they tell me I ran it low on oil. Wont ever buy another K motor again. Has anyone ever switched to a Kohler?