Video exported FCP7 to PhotoShop CS6 color mis-match on re-import to FCP7.

When I export a Quicktime from timeline (Prores 422(HQ), import to PhotoShop CS6 for spotting (no other filters or anything, just spotting out dust marks on a 16mm film scan), and export out as a Quicktime again (Animation HQ), the color doesn't match the original footage in timeline.

I've done this previously in PhotoShop CS5 and color/contrast matched perfectly on re-entry. I have color settings set up to favour the embedded profile in the FCP7 Quicktime, but no matter what settings I've changed to prevent it, all of the Quicktimes I've exported from PhotoShop CS6 appear quite a bit lighter than the footage sitting on the timeline upon re-entry.

Having spotted this same film previously, and quite successfully, I expected to be able to do the same again with CS6 and not have anything to worry about. If anyone can suggest something that I've overlooked, would much appreciate it.

Thanks.