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The focus of the picture is what's happening on the platform. It makes sense that Raymond would put most of his time making that look good and only outlining the characters in the foreground. They're mudokon-shaped but just simple sketches.
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Considering the Mudokon in the foreground has the strand of hair from it's head, but the rest don't, that seems to show they're different. They're also a somewhat different colour to the Mud in the foreground. Even if they're only meant to be simple and done quickly, a couple of strands of hair wouldn't take long, surely? It seems unlikely that that level of confusion would be created merely because of a few missing hairs. Their head shape is also quite different as well.
Regardless of 'quick sketches' or not, it seems unlikely that level of difference between the two would be created merely because it was a quick job.