I would say they are really the same. Although VN's and such give me the freedom to sort of explore the things that would be embarrassing or looked down on to admit is a turn on irl.
Incredibly different. like polar opposites.
Sometime experiences IRL will dilute my fetishes online. The best example is in the watersports department. I still find it hot to think about, but IRL that takes so much prep and cleanup that the idea has gotten less sexy to me after doing it IRL.
Imagine if someone was only interested in futa in real life and nothing else did it for them. I mean even furries can get someone to dress up. You'll never find anyone with both inny and outie genitals in real life.