I run 23's (23x8-11 on old honda atv rims) on the front and rear of my kinroad. Only problem you need to watch for is if the tire rubs when turned to full lock. On the 2+5 front rims I run a 1 inch spacer and they will rub if I crank it really hard.
To answer your question no you don't have to have smaller on the front. A few guys on here run 22's in the front and 20s in the rear. The larger front helps climb over stuff a bit better. 20s is supposed to be about all the stock gy6 can turn over and 22's is what most can fit in the front without rubbing problems.
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