Honestly don't know but needs to be clearly described!
I have owned both and since they are long gone from my accumulation I can't measure to be sure, but they honestly look different to me from old pics vs your pic.
My Frontier Scout (1963) was the 22LR cylinder fluted. I never had a 22 WMR cylinder for the Scout.
My Peacemaker (1974) had only the 22 WMR cylinder and was not fluted. It does appear longer in the below pics.
Like suggested go over to the Colt Forum and ask but if you get the same "yes they can", "no they can't" mix of answers then the best you can do is sell it by describing ONLY what you know for fact. ie: "I'm selling a fluted 22 WMR cylinder from a Colt Frontier Scout".
Best of luck in your sale.