Will a '96-'99 OM606 engine swap into my '95 W124?

I have all the auxiliary items--IP, manifolds, etc.

'96-'97 should be very similar to what you have in your '95. The '98-'99 turbo engines will be more difficult due to the turbo and intercooler. The '97 had the 5-speed electronic transmission, not sure what it would take to adapt a '97 engine to your existing 4-speed transmission. This same question was just asked here a few days ago; you might look for that thread to see what was said.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

You'll want to install the mechanical IP from your '95 on a nonturbo '96-'97 -- W210 switched to an electronically controlled IP. If you wanted to use a turbo '98-'99, you'd most likely have to find a mechanical IP from a 3.0L 603 turbo.

Not sure about the trans, per Jeremy... definitely look into that.

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99 E300 TD -- sold
01 540i 6 spd