Evaporator for 2013 XT - where and help on part number please

[punkieys17]

So our RHD 2013 Xt 2.0 SJG has a faulty evaporator (the part inside the cabin). I believe the part number start 73523...but would be helpful for a full part number. I can find a number of evaporators starting 73523 but Subaru never lists cross reference so there are ones listed for 73523AG031 or 73523FJ081. I donet know how there mind works...is 73523 there identification for a general evaporator then the code after identifies the different part.....OR is it the same part 73523 just given a different part number for the different models. Any help appreciated