Type I, Type II, with or without brighteners, hexavalent vs trivalent chromate, CAD Vs Zinc, base metal finish and prep, strength of bath, dwell in solution (particularly for the chromate conversion coating), and amperage applied during electro deposition. All these items affect the final appearance of the plating.

Survivor or not, the plating will not appear as it was when delivered, but may certainly give you an idea what the original finish was when installed, provided it was sealed against a surface that eliminated moisture or dissimilar metal contact.

I believe you do the best you can to finish the item as best can be determined, actual sheen and depth of color from chromate will vary from lot runs even when Ma MOPAR was ordering parts.