A public posting is not the governing document, but it exists and can be found. Where it conflicts with the offer letter, the inconsistency can prompt questions, so the case is stronger when the difference is explained in advance rather than ignored.
Consistency is what a reviewer can check
Anyone comparing documents is looking for a coherent account of one job. Two descriptions of the same role that do not line up put the burden on the applicant to explain in the moment, which is harder than explaining beforehand in writing. Preparing a short, accurate explanation supported by the employer removes most of that difficulty before it arises.
Do not treat the possibility of passing an employer’s test as proof that a missing degree or other required qualification already exists. A diploma holder must document thirty-six months of work related to technical publications writing with reliable dates, but the USMCA text does not require that experience to begin after the diploma. The internal title is not decisive, but a title that hides the profession makes the application harder than it needs to be, so the letter should be rewritten before it is presented. The offer must concern a listed USMCA profession, meet that profession’s qualification rule, and be prearranged rather than US self-employment.