Assuming that you are talking about 300D-turbo's, I think both engines are the same (5 cyl, 617...). Before '82, US model 300D's were normally aspirated and 300SD's had turbo's.

__________________
2001 Dodge Ram 2500 Cummins Turbo Diesel - 4x4, auto, 3.54 gears, long bed
-------------------------------------
'92 300D 2.5 Turbodiesel - sold
'83 300D Turbodiesel - 4 speed manual/2.88 diff - sold
'87 300D Turbodiesel - sold
'82 300D Turbodiesel - sold