Welcome to the forum
f57f-12b523-bc is the plastic holder for computer, so no, not something you need to replace unless it is broken
Seen here:
https://www.ebay.com/p/1528726537
Or here:
https://www.ebay.com/itm/165537752729
The Computer part number will always have xxxx-
12A650-xxx as the center number string, in any year Ford
F57F is 1995 Ranger part, F5 = 1995, 7 = Ranger, F is the Ford department that makes the part
So your 1995 computer part number will be F57F-12A650-???
The suffix numbers -??? do designate what specific engine/trans the computer is for
But several suffixes mean the same thing, so finding an exact match is great if you can but not often possible
Ford never released a cross reference for these
If you don't have a sticker on computer with part number then you will need to find replacement that matches your specific vehicle
There are 3 things to match
Engine size, 2.3l, 3.0l or 4.0l in 1995
EGR or no EGR, 1995 should have EGR in most states
Manual Trans or Automatic trans