I think its fair to say the 42 Apache(80's) is a stretched (via the transom) 38(39) Cigarette, thus giving the hull a longer constant section. The decks are different. The 42 was stretched to create the 47. If you look at the 47's(in side view) near the transom area you can see that eventually the the deck and hull lines converge. Stretch it 15 more feet and the transom height would be 0.
I am speculating that the 36 was made from a damned up 42 mold.
Because the Apache were made in a different shop, one would assume the glass layup schedule is different, with Apache using a few more layers of glass(total speculation on my part). I believe this was before they started using balsa core.
Aronow stretched/modified old designs to create "new" ones, which makes sense from a business perspective.
Some of this is according to the book Speed Kills(the 39 to 42). I presume the author got this info from Mark Mcmanus who worked for both Cig and Apache.