The cylinder heads on these engines are pretty much bullet proof. I
have not seen anything in the way of excessive warpage. The camshafts,
camshaft rockers, and  the camshaft sprockets are things to inspect on
both engines. If the valves are bent from a broken chain, both the
valves and the valve guides are replaceable. These engines are so tough
that even after the chain brakes and pistons hit the valves and put
marks in the top of the pistons the heads can be repaired and bolted
back on.  I believe you will have the following parts from the heads
that can be transferred to you engine. Camshafts, camshaft rockers, cam
towers, chain sprokets, and oil tubes mounted above the towers. The
valve guides and oil seals seem to cause the most problems with these
engines. The valve guides ware and even new valve stem seals will not
remedy the oil consumption problem. Depending on the way the intake and
exhaust ports are located it could be possible to simply swap heads
when this oil consumption problem happens to your present engine.
Have fun.