Vehicles get updated with every game update, in most updates there are full reworks of some of them, there isn't just 1 update that reworked everything.
IIRC, the first vehicle re-work was for the Gavril Bluebuck. So what ever update was before that I guess...
the bluebuck never got reworked. the first remaster as we know them today was the grand marshal, and it got remastered in 0.17.1
"Slightly" lol it completely overhauled some of them making all the mod parts clip and misallign and look bad