George Eastman House and other Museums archive film as color separation as do many motion picture studios. As I said earlier, the costs are much lower for analog duplication. Set up a printer and let fly! Digital often requires format changes from generation to generation whereas film does not.
As for 120 vs 35 in the above about Reala, you must remember that you may be seeing a difference in micro vs macro contrast in images at the same magnification. I have posted several times on this before.