For multi-coloured stamps such as this, the colours are printed one after the other - so they print the gold, then brown, then blue etc, as the paper runs through the press.
It happens occasionally that one of the colours doesn't line up correctly. I think you'll find that the blue on the left hand stamp was printed a fraction lower, so it doesn't line up with the lettering correctly. If you measure the distance from the bottom of the second O of Colombia to the top of the shield, I think you'll find them a fraction of a millimeter out.
The blue background behind the L is slightly lighter and was printed at a different stage. If you look at the background of the right stamp, you'll see that it's a fraction high left, leaving a thin gold line between the frame and the blue on the lower right. It also causes the frame to appear thicker at about the 10 o'clock position.
This creates a minor curiosity but nothing of value or that will generally be noted in catalogues.
P.S. When I say the left stamp, I'm referring to the first image of the 2 side by side. You changed them over for the second image

Balf