Does the external QA performed for the one company suffice?

We recently merged with another company. The IA function of one of the companies had an external QA performed last year. The IA activity in the other company had not had an external QA performed. Does the external QA performed for the one company suffice?

If the policies and practices of the surviving internal audit activity are based on the organization that had the external QA, then no further external QA would be needed. If not, then an external QA would be required.