If you are simply replacing an airbag on a existing sport wheel, use the part that corresponds with the build date. If you are doing a complete retrofit of a steering wheel and airbag replacing an older, outdated g button wheel, either would probably suffice.

From an appearance standpoint, the two airbags appear identical. The steering wheel for both are identical. The electrical adapter for both are identical. I think you're okay with either, but maybe somebody here has more knowledge or you can check with the BMW parts counter to see if they know.