One of these comics is one of the most consistently funny and original comics around. The other one hasn't had a particularly funny or original idea in years. Recognizing this to be the case, Pearls Before Swine has mocked Cathy rather viciously over the years. So Cathy Guisewite might be enjoying just a bit of schadenfreude upon seeing that Stephan Pastis used pretty much the exact same joke she did today.
The premise at play here is that old comedy trope of someone enjoying their time away from their spouse by doing things they couldn't do in the spouse's company. It's been done a million times before, and neither of these strips really adds anything new.
I nevertheless admit to smiling at the image of Larry the croc wearing a beer helmet.