I noticed that there is a difference in hit-points between vanilla and GloomyFurniture (GF) walls.

I also noticed, when stopping using GloomyVanilla (GV), that there is a difference in hit-points between walls built with GV.

It seems to me that GV walls are much stronger. Taking a limestone wall as an example a GF wall with GV 540 hp, Vanilla wall w/ GF 465 hp, GF wall without GV 390. All the same amount of bricks but markedly different hp values.