Product Numbering & Bar Code Verification of Phantom Plarail Sets

The Skyliner (Old Colour) theory of production stages: It seems that there is an unpainted interior window sill (early type) and a painted interior window sill (late type). On the left, a certain collector has both versions, my Skyliner is painted but it is in between both. We are not sure whether there are 3 types of Skyliners. If you search online, most of the Skyliners have unpainted sills.

Left is comparison between both, right is my Skyliner, showing 3 different sills.