Not only is it borderline illegal to take anything from Fallout 3 to New Vegas (NV Already has a majority of Fallout 3's things anyways) you don't really need to. My best guess is that because it is from Fallout 3, and chances are, no offense, your prolly a bit new to it, your getting wild inconsistencies. Honestly, if your looking for something specific for your mod, look over NV's objects and contents first, even if its not used in NV, doesn't mean its not there, and if its actually not, work on making some custom content.
No it's not

. I legally own both F:NV and FO:3, and I'm free to copy over any meshes for myself... So please, don't just assume I don't know what I'm doing. Speaking of that, I've solved it anyway.
Anybody else who read this, thanks for reading, problem solved.