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There's a Sugimori interview where he says for gen 1 artists didn't have any input on the official pokedex measurements(that was Tajiri iirc) so there were a few cases where they were surprised how the description didn't match at all how they had originally envisioned them.
It's pretty clear the 4 classic kaijus were all designed with the intent of being identically sized having the same proportions and yet Kangaskhan dwarfs the rest.
