I think the two vac pumps are the same but you should check a cross reference on the parts numbers to be sure. The CDs are all the same and are copies of the now out of print FSMs. Fastlane sells the CDs and you can also often find them on Ebay. Be prepared, the copy quality is not the best. If you are only replacing the pump, you can probably figure it out without the manual. If you get into IP timing, it helps to have some of the specs found in the CD. Haynes also makes a good general workshop manual for the 123 chassis (late 70s and early/mid 80s 300D) but is lacking in a number of areas, including IIRC the vac pump replacement. By the way, if you want to cross check the pump parts numbers, you can often do it by looking up the parts for the two models on Fastlane. If possible return them the favor sometime buy buying something from them since they sponser this site.

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold