I’m genuinely against adding a premium or event vehicle to any tree solely because of a different paint job, if that’s what you mean? Skins exist for that purpose.
That’s why, in my tree, I saw no point in adding separate Angolan copy-paste vehicles. For example, if Cuba operated a vehicle that was also in Angolan service, I didn’t list it under the Angolan banner, since you could simply give the Cuban version an Angolan camouflage skin.