It's apparent the while neither is designed specifically for the P380, the Pachmayr is a lot closer. The Hogue is too long, and has the finger-grip in entirely the wrong place for this Kahr - at best, it will require cutting to fit the P380.
OTOH, the Hogue has a nice palm-swell, while the Pachy has none.
So it's a trade-off - cut the Hogue to sorta fit, or take the Pachmayr, which adds a lot less thickness, but fits pretty well.
Just picked up my P380 that came with a Hogue grip. It seems to fit pretty well and makes the gun a lot more comfortable. There's a little bit of extra material at the back, but it's hardly noticeable. Here are some pics: