Most every card Post Cereal/Jello card cut from a box has at least one if not multiple variations. These variations mainly will involve the cropping of the image (these two copies of this card are also cropped different), but also with variances with the color/brightness of either the background or players image (as in this case). Most of these variances are due to what original product type the card appeared on.
Dan Mabey, a member of the board, has even self-published his own book on the topic.
http://www.sportscollectorsdaily.com...-cereal-cards/
Here is a thread on the 62 Canadian Post Cereal variations:
http://t.net54baseball.com/showthread.php?t=191745
For every Post Cereal/ Jello issue, there could be a similar thread.