Difference between the lgm227wd and the lgm227wd-pz

Hi, I’ve been interested in buying the tv/monitor lgm227wd i’m in the UK. The problem is there seems to be loads of sellers selling it as the lgm227wd-pz and loads selling it just as the lgm227wd.Does anyone know what the -pz stands for and are there any differences between them because the specs look the same to me.I’ve tried googling but i can’t find the answer.