Correct. 126 (post-85), 123 (post-85), 124, and 201 chassis with a diesel should all use the same cruise amp. Verify the part number on the can to be positively certain. A gas engine CC amp will not work on a diesel. They use different input signals.

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]