You can probably pick up "Returns" in the discount stacks for a few bucks, so it might be worth it.
"Revenge" assumes you know what happened in "Returns," so if you want to read either, read "Returns" first.
If you are really a hardcore Godfather freak, both books will piss you off because the canonical characters, mainly Michael Corleone, are such minor players in the plot, while page after page and chapter after chapter are spent on concocted characters like Nick Gerace, who we really don't care much about.
