The answer largely depends on whether the meeting organisers were aware of this but perhaps the results had not been updated.
If say this was a league track meeting and the A & B strings were changed round, then we are normally happy to reflect this on Power of 10. We may ask the team manager and/or meeting organiser to verify the switch.
If however this was a road race and you gave away and/or were given somebody else's number without the consent of the organiser this is not allowed and can result in the relevant parties being excluded from future events. As such, we cannot condone the practice by changing the results. If we became aware that somebody ran as somebody else we would change that performance to "AN Other" or "Unknown".