The yerfdog 3203 is a Tecumseh 6.5HP (212cc) engine While the Yerdog 3206 is the 150cc we see most often on here.
The 3203 uses smaller tubing for the frame, Single A arm front suspension, does not use rack n pinion steering, doesn't use an internal CVT with as many tuneable parts, or an internal gear ratio that can be altered.
Often using small engines that don't come with magnetos for lighting, or electric start. Many are pull start.
Can they be beefed up? Sure, ask X Bird. But it will most likely cost you more $ in the long run than buying the 150cc buggies in the firsrt place.
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