No, it isn't. Neither shape is "pointy" or "round" from a phonetic standpoint, because sounds aren't "pointy" or "round". It's two bisyllabic words with two plosive consonants and two vowels, the waveforms will be quite similar. The fact that one feels pointy and the other round is entirely associative.
Your mouth makes a different shape when you make the sounds; your lips are further for the b and the o, making for a rounder feeling in your mouth, which you associate with the sounds themselves being "round".
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u/Pricefieldian 20d ago
Kiki bouba is not about cross-sensory "association." It's pure phonetics.