Rear Door control unit

Hi Folks

I recently bought a 1999 Octy 1.6 from auction. I sorted out a few niggles except for one, the o/s/r door central locking and window were not working this meant that the door was deadlocked and couldn't be opened inside or out. I plugged in vagcom and the only fault on the whole car was 'no communication' with o/s/r/door.

I've managed to remove the door casing with the door closed (yes it can be done) and found that the door control unit (part of the window motor) was disconnected, with good reason the unit is burnt out.

My question (at long last ) is this, when I get the replacement unit will it have to be coded to the car using vagcom and does it have to be exactly the same part number. Reason i'm asking is the part number is damaged on the original and i'm not that experienced with vagcom yet, any help would be much appreciated, likewise if my experiences to date can help anyone feel free to mail me. Thanks