Thank you for your replies.
I know that it’s not ideal to grade on a computer monitor, but it will have to do for now. I can probably convince the local cinema to allow me to run a quick test once the DCP is done.
I had planned to add the grain in Resolve, but read a lot of forum posts about people saying that it was not possible in Resolve and that you needed to use another editor to add the grain afterwards.
However, by adding the grain plates in the second video track, changing the composite-mode to overlay and rendering the movie in “target”-mode instead of “source”-mode, I was able to export the movie with grain directly from Resolve.
I used easyDCP Creator to make a DCP of my 16-bit Tiff-image sequence and played it back in EasyDCP Player with “XYZ -> RGB” color conversion enabled. Now it looked exactly like in Resolve.
After Effects seems to be the sinner. I probably applied the XYZ LUTs twice. Good to know for next time.
Ola, about your monitor, which one do you use and what card?