>>4249427>photosite sizeWrong. It's sensor size. Period.
Why are you looking at the RP at twice the magnification as the GH5S?
If you got into a magazine would they release their next issue in 4.25x5.5 inches instead of 8.5x11 because shot your images on a GH5S?
If you rented a gallery for a week with a few photographers to display prints for an event would the gallery owner ban you from printing in 20x30" and said you have to 10x15" or smaller because you used a GH5S?
If other anon used a EOS RP would people viewing his images suddenly have their phones transfrom from 5.5 inches to 11 inches?
Your screen size is your screen size and will display the image from each camera at the same size when viewing it - this is how people will view the images. Your print size is your print size.
Pic related is how the images actually compare.