will a 2001 s10 stepside bed fit on a fleetside frame

I would think it would bolt on. Measure the bolt spacing for the bolts that hold the bed on.

My question was to avoid that process, because both beds are still on the trucks.

Avoiding measuring the bolt pattern? How easy do you want this to be?

My question was to avoid that process, bolt on or modified? If you cannot answer that question, allow someone with that experience answer.

Will a short bed fleet size work on a step side frame, it's a 2000 Sonoma step side