Based solely on these photos, I would say this plant's ID is suspect and that you're right to question it. I would also expect glossy leaves and significantly more undulation of the leaf margins.
However, I also can't 100% confidently rule out that it's P. vietnamense, and I'd at least have to see flowers to be absolutely sure one way or the other.
So I guess I'm saying, I doubt it's P. vietnamense, but I can't completely rule it out. I do know that P. Ho Chi Minh is sometimes sold (accidentally or otherwise) as P. vietnamense and sometimes it's tough to tell them apart definitively until they bloom.
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