Water heater base (support) size

I'm replacing a tall narrow water heater with a short wide water heater. The old base is smaller than the water heater. Is it important that the base be the full diameter of the water heater base. Right now, there's about a 2" overhang.
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If nothing else, put a piece of 3/4" (at least) waterproof plywood the size of the new heater base in between

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