What car/tranny do you have now? I can tell you that the 722.1 and 722.2 cases are the same(4-bolt pan, separate bellhousing), but the internals may be different. Case in point I have an 80 300SD (722.120) that needs a tranny. I am going to attempt to swap a 722.112 out of a 77 280SE. These are both 4 speeds, have a vacuum modulator and a mechanical rod from the throttle. I was about to snatch a 722.1xx from an 80 300D, but I finally noticed that it didn't have the rod. From what I can tell on mine , the 722.112 and 722.120 are both 4 speeds, and have the same physical characteristics. I checked with Jaggi, a transmission rebuilder, and they think this swap will work. There may still be some subtle differences, though, such as in the valve bodies, but I was told it should work well enough.

Your situation may be different. I wish there was more "swap" data out there, but I haven't found much.

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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)