I would think the decal shown above is the US version, it’s pretty minimal - just enough to complete a box top replica. I expect the expanded Euro sheet to have the US decals plus alternate police markings and maybe something quirky like stripes or graphics.
Iceman Collections makes a beautiful GMC conversion set for the Revell Chevies. It’s not Chevy, but a great alternative.
https://icemancollections.com/products/1960-1966-chevy-custom-grille-tailgate-hood-lip-conversion?_pos=2&_sid=018dc5976&_ss=r
IIRC, board user @zaina can 3D print you what you need. It’s not as cheap as a kit, but it’s not rubies either. I bought a’69 D100 cab off of him last summer for a ramp truck build. I know he offers the previous D100 gen. too (1962). HTH