There’s not any reasonable standard by which you could label Pathfinder (especially 1st edition PF, which is what Project Lawful is based on) as being “not D&D”, while also labeling D&D 5e as being “D&D”[1]. PF was, after all, informally called “3.75” when it was released (referring to the goal of the Pathfinder RPG project being to clean up and improve the D&D “3.5e” rule set).
It really is, though.
There’s not any reasonable standard by which you could label Pathfinder (especially 1st edition PF, which is what Project Lawful is based on) as being “not D&D”, while also labeling D&D 5e as being “D&D”[1]. PF was, after all, informally called “3.75” when it was released (referring to the goal of the Pathfinder RPG project being to clean up and improve the D&D “3.5e” rule set).
I won’t even get into the 4e question…