300D, 300SD, 300DT all used the same engine and injectors, assuming the turbo engine (OM617, all U.S. engines in 1985), w/ caveat: DT heads differed slightly. The injectors were 135 bar, as printed on yours. That said, you are just looking at the injector housing. The true injector is the innards, and the internal spring and shims sets the pop pressure, but unlikely the innards were swapped.

I think other Euro diesel manufacturers used the same or similar Bosch injectors, but don't know the differences.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans