burgandybolt:

Do you mean what are the differences in the C & K Series trucks or the differences in the seat in the C & K Series trucks?

There are no differences in the seats of a C10 (1/2 ton 2wd)/C20 (3/4 ton 2wd) or K10 (1/2 ton 4x4)/K20 (3/4 ton 4x4) Series trucks, unless you have the Custom Comfort Cab feature with the B55 RPO, full foam seat cushion.

I hope this helps.

Tony