Is the block the same on SOHC and DOHC?

What I am getting at is can one take the DOHC head and drop it on the SOHC block?

Engines
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L/CID
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Horsepower
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MPG
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Available
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Overhead Cam V-6 FI 3.0/181 160 18-23 1989-94
Double Overhead Cam V-6 FI 3.0/181 190 18-23 1992-97

 

And, hey, while were on the subject, is there a 24v crossflow head available for the L-series?

 

I am not sure if they would fit on the block but i dont think there is enough room near the radiator.

 

double overhead cam with maximas vg was in the 300zx and early maximas the 89-91s I believe after that they had different engines in the maxima, all dohc but there was the ve's and vq's in 95- crrnt dte