What you mean for "skin"??
Here are the first, second and third skin:
As you can see, second skin's graphics from bottom screen are untranslated. Graphics from top screen are translated because they're in the same file as 1st and 3rd skin.
BTW these graphics I can't find are shared by all 3 games.
There are 2 files that I still can't open fully: bij_back00.bga bij_back11.bga. By their name I assumed they hold background graphics for 2nd skin.
They have Huffman 8-bits compression (x28), when I remove their header. But when I decompress them the output decompressed files look like to have another compressed file at the beginning and some tile maps at the end. The problem is I don't know what kind o compression that is, and if that really is compression.