Hope this helps:
CARRE OR 386.50 € (gold) - most of Orchestre, first few rows of Mezzanine
CAT1 221.50 € (pink) - rear and sides of Orchestre, behind Carre Or rows of Mezzanine, all of Balcon Bas, first few rows of Balcon Haut
CAT2 139.00 € (green) - behind Cat1 rows of Balcon Haut
CAT3 84.00 € (yellow) - behind Cat2 rows of Balcon Haut (unassigned seats not shown on map)
The various other colours shown amongst those different categories are for VIP packages and Platinum tickets.