Reconcile the supervisor or reporting line, the specific duties described, the worksite location, and the assignment's start and end dates. Any of these mismatches can create ambiguity about the actual role. Once identified, request a corrected version of whichever document is inaccurate so both documents tell the same story.
Build a clean, matched document set
Go through each document line by line rather than skimming for an overall impression of similarity. Note the exact wording used for duties in each, since a generic duty letter and a detailed contract can create a mismatch even without an obvious contradiction. Once corrections are made, keep both the original and corrected versions on file along with a brief note explaining the change, in case the history is relevant later.
Hypothetical example: a Port Moody industrial designer receives a letter describing product development consulting, while the contract lists him as a salaried designer reporting to an engineering manager. The word consulting is the problem, not the duties. A first review would ask the employer to restate the duties in the terms the profession itself uses, name the reporting manager, and confirm the period.
It would separately check that the credential on file matches the industrial designer category rather than a general design qualification. Keep credential evidence in its own folder, apart from the commercial paperwork: the two answer different questions, and a reviewer looks at them for different reasons.