Are these the same kind of role?
No. Customer onboarding support coordinates an approved setup path after a customer moves into onboarding. Data quality support prepares evidence about missing, conflicting, or duplicate records. The roles can work beside the same customer record, but they have different sources and different decision owners.
Can one assistant do both?
Possibly, but start with one documented lane. The setup and data-review work should have separate source rules, held actions, named reviewers, and access limits before one person covers both.
Can the assistant fix a data issue during onboarding?
The assistant can flag the issue and prepare a source-linked correction packet. An authorized owner decides whether to change a controlled record, merge a duplicate, adjust permissions, change configuration, or tell the customer anything.
What should happen when a missing field blocks go-live?
Record the missing field, the approved source checked, the setup step affected, and the owner who needs to decide. The assistant should not infer an answer, change the record, or promise a new go-live time.