I will reuse mine if I ever finish rebuilding my 1985 OM617 engine. I did a gasket change on my 1996 Plymouth 2.4L engine which has "torque to yield" head bolts and the manual says to use new ones. I figured I could just yield them a little more. That was 18 yrs and 120k miles ago (now 230K) and no leaks since and still perfect compression. The OE gasket had a strange problem where it leaked oil to the outside, the fix being a PN change to multi-layer-steel gasket.

I think the difference is more from assembly. I think "torque-to-yield" definition is that you snug them to a certain torque, then mark the head and turn a fixed angle (say 3/4 turn). If you know metallurgy, tough metal like in bolts increases in tension as it yields until the diameter starts to neck down appreciably. That is why the main criteria is the diameter of the bolt. Head bolts are so long that it might be hard to locate the min diameter, so they spec a length stretch. As I recall, the short flex-plate bolts are spec'ed for a diameter neck-down, to allow reuse. But, don't quote me, just speculating, and I never want nervous-nellies following me in things like silicone brake fluid, waterless coolant, HC refrigerant, and ignoring much of the M-B FSM special-tools and methods.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans