Turbo motors got forged TRW pistons with a dish (8.5:1 instead of like 9.2:1 N/A). Same rods and crank. Same block really, just drilled for the oil return.

Funny story about the blocks, Ford would determine how many blocks of each run they wanted for turbo use. As they came down the line, each block was weighed. The heaviest blocks were pulled off to the side and drilled for the oil return. So technically the blocks might be stronger, but its such a small amount nobody really cares.

The later 89-up heads were dual plug per cylinder. Since 88 was the last year of the turbo motor, no factory turbo motor came with the dual plug setup. There are guys running the dual plug heads with turbo's, but nobody's making big power because the ports are pretty restrictive on the dual plug heads.