What's the diff. in fuel injectors?

Picked up a set of Bosch NA30X rebuilt injectors from an '81 240D at a junk yard today. Are these the same as NA33X? Most parts houses on the web show the NA33X for the 240D and the 300D (77-82). I cannot find a listing for a car using the NA30X but that's what the rubber band around the injector says. Info stamped in the injector behind the rubber band says 435 bar. Will these still work in an '81 300D?