W-2 and T/A offset rocker arms the same?

the w2 ductile iron rockers have the same offset as the w2 aluminum ones which is .775...

the ta ductile iron has the same offset as the aluminum ta rockers which is .500


could the w2 rocker work on a ta head..maybe.....as long as the pushrod length is adjusted for the bigger offset and they dont rub....

which makes you wonder why HS has different part numbers for the different rockers.