In some occasions I encountered exactly the same thing. I’m not able to reproduce it every time though. I checked that both in C1 as in PS I apply the same colorspace, AdobeRGB.
By the way, I also see differences in sharpness on screen in C1 between the RAF and the in C1 returned (Edit with Photoshop, close) TIF. This is not related to output sharpening (screen, print) as I’ve disabled this function. Besides this the RAF/TIF histograms also look very different, weird.
Regards,
Jaap.