Hi Larry!
Sorry for the delay. I do not have a chart, but I will try my best to remember.
The 10" and 12" Chopper scales are the same except for the Heavy Chopper. (I think)
The EDC scales are interchangeable, but the EDC1 and EDC2 and their scales were slightly different thicknesses, so this could make your sheath tight or loose, depending on the combination.
The DEK scales are all interchangeable.
The Original Field Knife has its own scales and are not interchangeable with anything else.
The Field Knife 2 can be interchanged with the Signature Field Knife (FK3), Basic Field Knife and Fat Bastard Field Knife. *Note, the FK2 has the lanyard hole cutout, the others do not, but they do fit.
The Shivs (1 and 2) and the Utility Fighters (1 and 2) all have their own scales.
The Kephart, Comp Chopper, K18 and K20 all have obviously different scales.
The HDFK and SDFK also have unique scales. Please let me know if I left something out.
*ALSO* With many of these, even though the scales are the same, they may need different hardware (standoff lengths),