Here's a few comic book covers where a Frankenstein Monster is encountering super-heroes!
Action Comics 531
Superman 143 (in the Silver Age Superman comic books, there was apparently a weekly Frankenstein TV show starring the monster)
Detective Comics 135
And, just for the heck of it, these Avengers stories were reprinted in an overseas Thor-titled comic book:
Iron Man 101 (two covers because there were, as you can see, two different prices being offered, depending on where you lived)
Silver Surfer 7
Marvel Team-Up 36
So far as I can tell, only the Iron Man, Team-Up, and Avengers Frankenstein Monsters turned out to be the same one that was in the Marvel Frankenstein Monster comic book!