mikiep, recoil is subjective, but all other things (mechanism, weight, etc) being equal, I personally find the low-recoil 12 gauge still kicks more than the standard 20 gauge. YMMV.
You didn't mention what type/model of 12 gauge Remington you're using, but I wouldn't trust low recoil loads in any 12 gauge autoloader these days, except the Hornady rounds marked on the box especially for semiautomatic shotguns.
It's surprising how little difference there is between low recoil 12 gauge buck, which is most commonly encountered in 00 size, and standard ("Express") 12 gauge 00 buckshot in terms of penetration. I would expect it to definitely penetrate deeper than standard 20-gauge buckshot, which is typically encountered in the smaller #3 size.