When this was done 4 years ago through DavidB8 and Alex@Europrice to do the LED ROW conversion on '09 & '10 B8s Alex had to re-wire the tail light wire harnesses at the plugs - not sure if this would apply to the '11 tail lights you've picked up - contact Alex@Europrice.
Send DavidB8 a message at http://www.audienthusiasts.com to do the coding - IIRC requires a VagCom/VCDS cable and a remote software setup.