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If you look up taillights at RealOEM.com (or other parts websites), they seem to indicate that the updated 2011+ taillights on both R55 and R56 no longer use a bulb board. Each bulb has an individual holder that fits directly into the back of the light housing. You can find a part number for the bulb board up to 2010 but not after. In other words, they are incompatible.
yup. I didnt know OP was trying to mod a 2010 pre LED to 11+ LED tails. OP, Doing a complete assembly swap probably wont work because the wiring and connectors will be different as RKW said. Also, because the LCI tails are LED, your electrical system might throw a bulb out indicator