how to link full resolution video to proxy with different audio channels

Hi, so I finished editing a series with the proxy files I recieved from the DIT team. I've just got the full res files and was going to link them. I've worked with this workflow on the same job multiple times but this time the DIT team synced the audio with the camera for the proxy files so the audio channels for the proxy and full res files don't match-hence the problem.

I've tried the method of offlining all the proxies and relinking the originals instead, but I don't know if it's because the proxy is a mov file and the full-res is a mp4 file, they don't sync.

Please help..