Be careful here-
The mounting points on the engine are the same, but the alloy arms that bolt to the chassis are very likely different for all chassis.
The pre-1980 OM617.95 is rated at 110 Hp vs 120 or 123 for the later W126 and W123 variants. The earlier camshafts weren't as hard as the later ones and can wear.
The upper oil pan on the early engine that fits the W116 is smooth. On the W123 and W126 it has stiffening ribs. The later engine will not fit a W116 chassis without swapping (or grinding
) the ribs. This would be to clear the rear subframe bar that the W116 has. An early engine will fit the W123 or W126 chassis , but not the other way around, unless you address the oil pan.
Rick