I maybe sorry for asking this question, but after having recently posted in another thread a question about the various varieties of coil stamps for the above issue, I came upon this pair, which I believe are Scott 2913's. However, there is a distinct color misregistration on them as I have highlighted, including a smeared line across the center of the stamps:

As these are used stamps, I suppose the smeared line across the center could have been caused by a mail sorting machine, but the other highlights are definitely attributed to color misregistration.
I wonder if this is a common occurrence, as I don't seem to see it on any other Flag over Porch stamps that I have.