Konami use to take a lot of PES games
japan the first (WEx)
then an asian championship (WExASIA) with different leagues from asia
then european (PESx)
then an american version (WEx)
and finally a japan league version, this last version is usually the best from a serie (WExJL),
They change the names the last two years with WEPES200x series.
Konami, i think, make every time a beta ! and make some changes for every game and try to make better
For me the WE series are NTSC (60hz) series and are a lot faster (for me the demo is very very slow and no it's not my computer!!)
i play about 8 hours pro week since PES3, and i try every game on PC (it's exclude japan asia and jl versions) and WE is for me and my friends always for every year the best, because of six months of work between european and american version.
And noone can says that PESx=WEx never never happened..
Xcuse my poor poor english