NISTUNE QUESTION. 1996 Ka24de engine vs the rest ?

[Aftermarke7]

Searched the forums and cane up with no good results.

There are two different nistune type 4 boards available.
One is the standard type 4 board http://www.nistune.com/equipment-products-type4.php
The other is a type 4 dual rom board. http://www.nistune.com/equipment-products-type4dual.php

According to nistune the dual rom board is for 1996 ka24de ONLY and the regular nistune type 4 board is for 1995 only... and a bunch of other engines. (sr20 rb25..etc)

My question is WHY !
What are the differences between the 1995 and 1996 ka24de. or even the 1996 vs 1997 ka24de. sensors, harness, what?

Why is the 1996 singled out for the type 4 dual rom board?

Whats the difference !

BTW. I have a type 4 dual rom board for sale. 1996 ONLY (apparently).
It came with a turbo kit I bought from a friend.
Here is what its tuned for:

Z32 MAF
550cc injectors
bottom mount
blow through set up

Let me know what you guys think