I have both LC9 and KLCR, and they both pocket carry well in the same pocket holster, and are about the same weight. I have had both guns since they were introduced and have pocket carried either one daily mostly in Wrangler relaxed fit jeans.
Recoil is not really an issue in either one, but the 357 mag will get your attention a bit. I train with 38 spec +p in the KLCR and it is no problem for me. I am 68 years old and arthritic, and recoil is, again, not really an issue for me, YMMV.