The content for PLQ mod 6 was changed about a year ago, but some Areas/Bde's may not feel like running 2 different courses. The Reg F CSS/CS do the CF-PLQ, and the Reg F CA (and maybe the engineers) do the PLQ-Land. The Reserves do the PLQ-Land. As indicated above, the INF is supposed to do their own PLQ-INF. It was the same way for the JNCO crse- one was CSS, one was INF.
I'm not well informed on the PLQ-INF, so I'll leave that one alone. The CF-PLQ is basically the old JLC, which included drill, knowledge and skill lessons, as well as small party tasks. In addition to this, the PLQ-L includes Army leadership, such as leading patrols, def routine, and quick attacks.