Agent Orange here is my best explanation for ya, if ya have any other questions about her shoot away

,, its a 1988 when jackson was still just a smaller custom shop. Many of these late 80's guitars have metric size pots and had funky wiring being used believe it or not.
All of the newer jackson usa are going to have the cts size pots...
Another instance that is different, is mine has the jackson licensed floyd instead of an actual floyd rose. They had an option for the Floyd for an upcharge. Where as now on the newer models if you get a usa you are going to get a floyd stock.
As jackson got bigger as a company these options started becoming standard on their usa models,, such as your floyds and cts pots ect..