Not really sure I understand the question? Should be fairly black and white - if the spec sheet has option code 333 for an mt1, and 335 for an mt2 it's an m325i.
All of the m325i goodies were also a either factory option, or available as dealer retrofit aside from one, which is the black headliner - it wasn't even listed as an option if you run the vin of an m325i, so if it's got the headliner, you can be fairly sure you're looking at the genuine article.