Similar jokes with the same topics but the analogies vary enough to be independent or original.
I think the closest they come to one another is the Bisexual part of the jokes but that's easy for two different people to surmise what they think Bisexuality is in a nutshell, not counting "Pansexuality" these days.
The Gun Store jokes had enough dissimilarity and to believe that NEITHER of them came from a Gun culture to have those experiences is not much of a reach to me. Dave even spoke specifically of Bird shot and Buck shot, not Shotgun vs handgun. They both wanted Home Protection and both got standard recommendations.
It's two topics that two different comics gave on both issues.