These two are about the same size and weight

Both weigh 10.8 ounces with a loaded magazine

Both fit and work well in the Desantis Nemesis. This will revolutionize pocket holsters. Never before has there been a material this viscous. It's so sticky it's almost like fly paper. This pocket holster will absolutely not move out of position in your pocket. The inside is made of slick pack cloth for a no friction draw. Ambidextrous design.

The guns are about the same, the Ruger has smoother edges

The magazines are about the same but the Ruger can use either magazine, while the Keltec can only use it's magazine

The Ruger offers a bolt hold open which is handy for shooting at the range