Thanks for the link. This is a different part number than the one for the BEW. According to the 1stvwparts.com lookup, this part number supplied by ESC (03G128063A) superceded to a new number, 03G128063G. The part ECS shows is made by VDO, whereas the one for the BEW is made by Pierburg, although this may not matter.
List price for 03G128063G is $300 and "your price" is $219, according to 1stvw. Will it physically fit and work on a BEW? I have no idea.
As for swapping the electric motors, with the manufactures being different, I doubt that the motors are the same. That link I posted below states Pierburg makes their own electric motors for their throttle bodies. And the Pierburg throttle body on the BEW is pressed together, not screwed together, like the VDO one pictured on the ECS web site. You would have to figure out how to physically get it open. Perhaps you could bend the crimp.
If the motor does not work, try opening it up and seeing if you can fix it. Either re-cripm the case or use a dremil tool and carefully cut the cover off and use aluminum duct tape to secure the cover if you can fix it.
Here is a useful link about the inner workings of the Pierburg diesel throttle body used on the BEW:
http://www.kspg-ag.de/pdfdoc/kspg_produktbroschueren/p_drosselklappe_e.pdf
038128063L, for the BEW, lists for $400 and is $351 from 1stVWparts.com. It is too bad ECS tuning does not have those.
--Nate