The best practice is the job seeker should apply to the requisition; otherwise, you may be at risk of "steering" candidates, which OFCCP pays close attention to. In addition, OFCCP may suggest that the candidates from the initial requisition should also be considered for the other requisition. As you can see, it starts to get complicated. Thus, as a best practice, simply request the applicant to apply to the requisition.
You can use this OFCCP audit checklist to ensure you're doing what is required to maintain OFCCP's regulations including VEVRAA, Section 503, and EO 11246. Or request a demo to streamline your compliance and recruiting efforts.