What are the differences between the 617 950 (from the 78-80 300sd w116) and the 617 952 (the various 300d turbos)...other than the chasis applications?

I know both are turbos and 5 cylinder and that taps my knowledge of the differences!

Thanks, Don

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84-300D 256K
81-300SD 217K (Wife's)
79-300CD 212K - Project
89-Volvo 245 305K