Corvette tank stickers

[Motorhead848]

I’m curious if Gm changed the way they called out the RPO codes on corvette tank stickers through out production. Specifically referring to 67 400hp cars. We’re looking at one that says L36 at the top for 390 then in the bottom calls out L68 at the bottom which reads “conv 390 to 400”. Then the other says L36 at the top for 390. Then at the bottom says L68 “triple 2 bbl carb” I would think it would be consistent or did it depend who was typing the order copies out?

Some input would be great!
Thanks