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Engine difference

I have a 71 model truck that im swapping to big block and im wondering if the truck castings were different from passenger car.
 
I believe the passenger car and light truck big blocks are the same. I don't know if there are differences in the B and RB engines used in the heavy duty series like the Dodge 600 trucks
 
Thanks alot folks. I always thought thay were but never took the time to really try to find out. Because this 71 D200 was a LA motor 727 spicer / dana my intent is to land the 727 on the same mount location and im wondering if the block was different for the motor mounts. You know, ear location. Depth or angle somethingi can tell you that i moved the holes in the frame pad rearward 3/4". It all sits and fits nicely. But i cant see whats not built yet so im looking for that ifo as well. Any and all help is appreciated.
 
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