You're absolutely correct... Probably the BEST DIRECT example is the Ford Basildon engines. They were designed as a diesel engine and were mostly uniform throughout the range having 3, 4 and 6 hole versions utilizing many of the same parts. These engines were then modified to spark ignition... but the bottom ends were identical. I believe the cam was also identical. Heads were similar... main difference to drop the comp ratio was in the pistons. The gasoline engines made considerably ~more~ power on the same displacement... so they generally used a bit smaller displacement on the gas engines for the same model tractor so as to keep the power level the same. I suspect that peak torque for a given displacement WAS the same but the spark engines were probably a bit more top ended on power which is why they made a bit more....
So as it applies to the previous arguement... I think if you had a direct injected spark ignition engine built to diesel specs... with a turbo... you'd probably get pretty similar performance to a diesel engine... and mabey even close to the efficiency we've known from diesel's.
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