Bulb is the same. I have seen 3 of the 4 different part numbers.
Also, as discussed in a different thread, the bulb is a Mercedes/Bosch design used in millions MB (and BMW cars).
Apparently the MB guys knew it before we, the JAG community figured it out:
Post #7 from July 2010 here:
Kirby’s Book was cited in their forum. Well done!