153 combine engine

I don't have my book in front of me, but I believe the main journals are the same size. I'm not sure about journal spacing. Rod journal diameter and stroke are different than a 123.
 
I have been advised that a 123 block is the same as a 153 block but it has sleeves and a 153 doesn't. Also the 153 crank has a longer stroke.
Is this correct?
 

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