I opened a Nikon raw on my iPadPro, Surface Book and iMac applied the same raw development settings to the image and exported as a 16 bit Tiff with the same settings applied (full disclosure, I forgot to remove the spot top right hand corner on the windows version) and got slightly different results, with the iMac and Surface Book looking the same, but the iPadPro version slightly different when they are all viewed on the same screen. Viewed all 3 on both the iMac and Surface Book and the same results. I couldn't compare on the iPadPro as it just didn't want to display the 3 images - more an iPad thing given the iMac and Surface Book with full os's were able to.
My question is.....should I expect the same result from these products on different platforms? It's noticeable that the iMac and Surface Book versions are the same file size and same look, whereas the iPadPro version is a slightly smaller file and looks slightly different.
The machines were all running the latest version of Affinity Photo:
iPadPro AP 1.8.4, iOS 13.6.1
iMac AP 1.8.4, Catalina 10.15.6
SurfaceBook AP 1.8.5, Win 10 Pro, 19041.450
As far as I can see all at the latest versions of product and platform