They are identical.
I think the only reason the 86 engine is "more desirable" is the cams tend to be more durable (they usually don't suffer from the pitting problem), BUT some of the 86 engines did have a problem with soft valves and would "tulip" and eventually kill the cylinder due to loss of compression.
chances of getting your hands on one of the bad ones is like finding a needle in a haystack today..... most of them have been tossed, and after 25 years, I wager they all are gone now. None of those valves lived 30k miles. most were shot before they got 20k on them.
Mine only has about 12K!
Mine only has about 12K!