Based on color list, i see vampire and supernova has same colour and so on colour code.
Is vampire and supernova still same colour on they appearance in-game? If so, why colour code was a same?

They're not.

One uses 41 and the other 71 in the color code.

If you're talking about the joints; RGBs are the same but the saturation for Supernova is higher in-game somehow.