Here's the breakdown:
Royal Class - the very first limited edition box from the new kit family, filled with PE, resin parts, extensive decals sheet (usually 12-14 markings), sometimes even more extras and a little bit of magic straight from the local unicorn
Limited Edition - box filled with PE, resin parts and extensive decals sheet (usually 12-14 markings), in case of Dual Combo you'll get parts (and extras) for two kits
ProfiPack - box with colour PE and masks, decals usually with 6 markings
Weekend - no extras, decals usually with 4 markings