The New Yorker has a feature called Laugh Lines. The challenge there is to place several cartoons in chronological order. We’re going to play a version of this with pairs of cartoons that appear in the CIDU archives. Each pair will be from the same comic, so style will be a clue. The link with the letter points to the original posting here at CIDU. The years aren’t that far apart, because they only go back to when Bill had to restart the site. I’ve added a couple at the end that aren’t from the CIDU archives and are farther apart.
Pair #1. A:
B:
Pair #2. A:
B:
Pair #3. A:
B:
#4, a triplet (not from CIDU archives)
A:
B:
C:
#5 (not from CIDU archives)
A:
B:
Comics I Don't Understand 
I hope you realize that the copyright date is visible on the Pearls comics, 2019 and then 2023.
Same with Gasoline Alley, but I remember the 2025 one.
I hope there will be an explanation as to the clues, since, for example, I don’t see much difference in Stephan Pastis’s art style in the two Pearls Before Swine strips.
The previous CIDU appearance of 1B was https://cidu.info/2023/08/14/sakartvelo-to-start-with/#comments . There is a nice discussion, including the contribution of this:
Wait, you mean to say June and Rex weren’t always married?