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I'd keep them as a single race if possible, and represent any future variations as subraces through either ARTs or racial custom specials.
If you'd like to see an example of a race which changes size, I believe there are several you could look at. The Vanara ART "Change Size" from blood of the beast is one, the Exscinder Archon from Bestiary 5 is another, it has a racial ability called "Change Size" that lets it be anywhere from small to large.
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