I just looked on the body of that "different" injector and see that it says 135 BAR, which is the injector that the turbo diesels are supposed to have, not my 240D, which is supposed to have a 115 BAR injector. So it looks like someone swapped an injector from the wrong car.

However....the pop pressure tested this injector to pop within 10 psig of the others, so does it really make any difference? Maybe they put a weaker spring in the body, or removed the shim to get the pressure lower. So as long as it pops at the correct pressure and as long as the bottom of the injector goes the same distance into the engine, does it really make a difference?

No.

Google shows the NA30X to be a
FUEL INJECTOR, BOSCH REMANFACTURED


http://store.impartsol.com/fuelinbosrem1.html

__________________
1985 300D 198K sold
1982 300D 202K
1989 300E 125K
1992 940T

"If you dont have time to do it safely, you dont have time to do it"

"The democracy will cease to exist when you take away from those who are willing to work and give to those who would not."

Yes, it appears that the NA33X is an updated version of the NA30X, which is for the 115 BAR injectors for the older non-turbo diesels. The NA34X is the updated injector for the NA31X (135 BAR), which is used on the turbo models.
All of these appear to be Bosch injectors.