The evidence should accurately describe the actual arrangement being assessed.
Keep employer-specific facts attached
Duties, anticipated period, compensation and parties may differ. A reusable personal credential does not make employer records interchangeable.
If the reissued letter differs from the original in duties, title, salary, or dates, that difference should be explainable by something real, such as a restructure, rather than by editing. The applicant should also assemble proof of Canadian or Mexican citizenship and the evidence demanded by the chosen USMCA profession, including a reliable credential evaluation where applicable. Costs attach differently: the employer's drafting time is internal, while retrieving a diploma from an institution abroad is a personal expense someone must agree to cover. Expedited passport service shortens one queue and does nothing for a birth certificate held by a foreign registry, a transcript that must be reissued, or an employer letter waiting on a signature abroad. If the contract names a different client, location, or pay structure, decide whether the support letter must be revised and signed again; a private explanation cannot make conflicting originals agree.