IIRC, there were 2 different interiors: the base and the Custom Interior.
Base was bench only and pretty plain, could be cloth inserts or all-vinyl.
(Buckets on a Nova were typically only available with the upgraded interior. All-vinyl.)
I'm not familiar with those door cards, but I'm pretty sure they indicate the upscale interior.
Novas were "X bodies", though the cowl area and most of the chassis is the same as a 1st-gen Camaro.
'67 Camaros differ in rear springs & shocks from '68 - staggered shocks & multi-leafs debuted for the '68s.
A 396 in one of those is a tire-fryer, and formidable if you can hook.
Get a dealer brochure (Ebay, Irv Bishko, etc), if you can't find a Nova site.