Time once again to take a look at two Marvel Comics covers (the original and the book that reprinted that issue) and compare them, looking for changes that were made between them!
First up, we have Amazing Spider-Man #34 and the reprint in Marvel Tales #27, and we're obviously dealing with an all-new cover here, although I'm not quite sure why... the original cover had enough space to put blurbs for the Thor and Torch reprints!
Next, we have Avengers #71 and Marvel Super Action #32... we've got a reduction of the original art, but note that there's been some paste-up work done, to! The figures aren't in the same relationship to each other they were before, and the Eiffel Tower in the background is differently scaled. Note that Namor had his leg drawn in the rest of the way on the reprint, too.
Next up is Sgt. Fury #22 and #124... yes, there's been some balloons added, but the background's been changed a bit, too!
Here's Fantastic Four #111 and the reprint in Marvel's Greatest Comics #91... the cover's been flopped, the word balloons and title blurb relocated, and a new blurb added, plus an overall reduction of the art. Note that at least one of the windows has been changed to have a different person looking out, plus some of the background buildings are different.
A major reduction of the art was done when Amazing Spider-Man #75 was reprinted in Marvel Tales #56... as well as some paste-up work done so Spidey appears to be closer to the window than he originally was. Perhaps some small redrawing was done on the corpse, too.
I don't spot any major changes between Captain America #102 and the reprint in Marvel Super Action #3, other than a reduction.
It's not often I think that a new cover on a reprint is an improvement over the original, but I personally think that the cover of X-Men #27 wasn't as good as the new cover when it was reprinted in issue #75!