One of the earliest rules I learned from blogging is: be careful when you're presenting material from a reprint as opposed to the original publication.
Sometimes art has been re-drawn; sometimes words have been altered to eliminate mistakes or conform with more recent continuity. That's why I try to note when a story I present panels from is a reprint, because it just may different than the original.
Trivial but profound example: a Google image search for something else led me to this panel...or rather, 4 different versions of this panel, from 4 different websites:
Now, I'm not going to tell you that one of these panels is preferable to the other, that one is superior. Indeed, such re-coloring might be necessary due to time and/or unavailability of the original materials.
But think about this: if one relatively inconsequential panel can differ so much from printing to reprinting to re-reprinting to re-re-reprinting...what about everything else in the story?
So remember--when you're reading a reprint, or even a presentation of the original one on of these new-fangled digital platforms, you may not be seeing same thing the contemporary readers saw when they grabbed it off the rack. Even in a particularly important comic from an artistic legend.