Time again to compare and contrast the original Marvel comic and the book it was reprinted in (or in some cases, replaced entirely)!
The covers this time around either have completely different artwork for the reprint, or there's no change! Here's my first comparison, Sgt. Fury #3 and Special Marvel Edition #5. Obviously, we're looking at entirely new artwork for the reprint! I never quite got why Marvel would do this, with my best guess being that they were trying to make the book look like it's new stuff, rather than a reprint. I prefer the original myself, although the new cover art isn't bad, either -- it's like seeing two different artists, being given the same description, coming up with their interpretation!0
I can't spot any real differences between Avengers #49 and the reprint in Marvel Triple Action #41, aside from the art being reduced a little bit.
Next, it's Amazing Spider-Man #39 and the reprint in Marvel Tales #29... and again, it's an all-new cover, although I think the original far outstrips the new cover, don't you?
Sub-Mariner #5 and Tales to Astonish #5 don't have any real differences, other than the reprint featuring a reduced cover (unusual for this reprint book).
And finally, we have Avengers #16 and the reprint in Marvel Triple Action #10, and it's an all-new cover, featuring a very different scene, doesn't it? I prefer the Kirby original to the Kane version, but that may be because (1) the original is such an iconic cover, and (2) Someone miscolored Giant-Man's costume on the new one, making him have bare arms. The first time I ever saw it, I wasn't sure who he was supposed to be!