Pretty much that. The only armour that is not in some way a modified F3 one is the Tribal armour.
Actually, the Tribal armor is just a retextured version of the raider blastmaster armor. See my above post for linky.
In fact, let's just compare them all, shall we?
http://images4.wikia.nocookie.net/__cb20100610154808/fallout/images/thumb/0/05/Fnv-tribalpack.jpg/557px-Fnv-tribalpack.jpg = http://images3.wikia.nocookie.net/__cb20081117124348/fallout/images/thumb/4/44/Armor_raider_blastmaster_mf.jpg/278px-Armor_raider_blastmaster_mf.jpg
http://images2.wikia.nocookie.net/__cb20100610155453/fallout/images/thumb/6/68/Fnv-classicpack.jpg/557px-Fnv-classicpack.jpg = http://images2.wikia.nocookie.net/__cb20090202221518/fallout/images/4/43/Armoured%2802%29.jpg (Can't find a picture of the female version)
http://images1.wikia.nocookie.net/__cb20100610154106/fallout/images/0/00/Mercenarypack.jpg = http://images2.wikia.nocookie.net/__cb20081223235431/fallout/images/8/8f/MetalArmorFemale.jpg
http://images1.wikia.nocookie.net/__cb20100610154731/fallout/images/thumb/4/45/Fnv-caravanpack.jpg/557px-Fnv-caravanpack.jpg = Lightweight Leather Armor (This armor is really the only armor of the bunch that isn't just a simple retex)