Penguin Colours

It's based on/copying the Koga, but things like the lack of black line and so forth is meant to distance it.

An homage rather than a facsimile.

Yes, Penguin itself varied the style over the years, but I don't think they ever had solid lines between the white and the other colour (except for the emblem at the top):

The closest they got were the lines straddling the white and orange.