I'm going to buy 1993 f350 and it's utility bed on it.I want to swap the bed to standard bed, is that possible?

Truck ford bed

Sure. I would recommend a Temperpedic. But don't buy new if it's going in a truck, just keep checking greglist.

Most utility beds fit without major frame modifications, you could probably check with the unnamed manufacturer to see if they still have fitting documents for 25 year old equipment.

You MAY be able to find a serviceable (or repairable) pickup bed in a local auto salvage yard. Sell the utility bed to recover some of the cost. You'll probably need to have it painted to match the cab, but if it came from another F350 of a similar year, it should just bolt right on.

Yes just make sure you get the right bed for wheel length