I'm still a little confused about ranges but I think a polarised range is either nuts or air (so both ends of the spectrum) and a merged range could be spots like semi-bluffs and medium strength hands (a smoother distribution). I'm sure someone will correct me!

I made the bad question.. I meant: "I just wanted to know if a UNpolarized range is EXACTLY the same than a MERGED range??

Unpolarized means "not polarized";
Which is different from merged (that means your range is top x%).

This might help you

polarized vs merged ranges

The most basic difference between a polarized range and a merged range is your polarized range will be made up off betting and raising hands, i.e. value & bluffing hands, and your merged range will contain hands that you would most often check and call with.