There were four versions of the Scout kit. The first was a 76, with stock bucket seats, and single exhaust. It was orange on the box, and molded in orange. Then it was released as a 77-79 in two versions. One was stock,(molded in yellow, and yellow on the box, if I remember correctly), and an "off road" version. The O-R version had racing seats, a roll bar, headers and side dump dual exhaust. It was green on the box art, but molded in red. The fourth version was an SSII. It had the racing buckets, rollbar, etc, as well as the SSII grill. It was blue on the box, molded in tan. The decals also varied from kit to kit.
What you are seeing on the outside of the interior is the outline of the SSII door cut outs. The sink marks are on every kit I've ever seen.
Don't know the full design history on the kits, but, in working daily on the 1:1, there is no way to modify a Scout II body into a first generation Scout (61-71).
Hope that helps!