Powerfold mirror retro fit. Advice sought.

[garagedood]

Read about this in the Dec. 16 mag.
I fancy having a go. I have kept an eye out for the parts required - x2 powerfold mirrors, x2 door modules.
Over time I have collected both both mirrors - in the correct colour and excellent order (result) - and have spotted the drivers door module with the correct FoMCo part number.
I have not yet come across a module for the passenger door.
There are lots of identical looking modules on ebay and suchlike from Freelander 2 and others. Does anyone know if there is any interchangability between JLR products of the same era?
There are a few with the same numbers only the last two characters being different. The mag says - drivers ending in EK, passenger in KK.
I have seen them on eBay ending in CK, LK and some others. Does anyone know if they are worth a punt? What does these letters refer to?
I could just order new parts but that takes the fun out of it, and would cost quite a bit of wedge!
Any help appreciated.

[mike020150]

It might be worth having a punt if you can find a module at a next to nothing price. You could always re-sell it. Typically, the problem across manufacturers and models is the number of combinations of different variants, some with heated glasses, some without, dipping on reversing etc. Then, when you have achieved success and cracked the codes, we will all be wiser! Mike.