http://www.amiga-stuff.com/hardware/2mbit-maskrom.htmlThe modification for some reason swaps pin 38 (A10) and pin 32 (A16).
The only thing I can think of is that you had at one time a "piggy back" kickstart switcher?
If I were you, cut the wires with a wire cutter somewhere in the middle. Making sure the wires dont touch anything (perhaps put tape on the end) just fit your new chip as normal.
If it doesnt work... then maybe you have some sort of developer A1200 and need to bend the NEW ROM legs and re-apply the patch wires.
I feel confident that if you cut the wires the new ROMS will just work if installed correctly.
If you leave enough wire on each end you can always re-connect the old roms later.
