No. It supports the proposed employment account, while the actual status and required process need assessment. A private letter does not itself extend authorization.
Describe the next phase separately
Identify whether duties, employer arrangements or terms change. Do not assume the same project name means every relevant fact remains identical.
An acquisition does not change the underlying USMCA professional requirements — citizenship, a listed profession, the matching credential and prearranged employment still apply — but it can change whether your current facts still satisfy them. A process engineer's TN eligibility rests on three separate things lining up: a listed Appendix 2 profession, that profession's own credential rule, and duties that actually match the entry's definition. With a letter from each employer covering the management years, stating the exact title, start and end dates, the departments and number of staff supervised and the budget responsibility. If the controller's actual duties are accounting functions, the application may use the Accountant profession with a listed professional designation or a baccalaureate whose subject significantly overlaps the accounting work. The practical discipline is an annual review: read the original letter, compare it with the present job description, check the licence status, and correct any drift while it is still small.