sb -VS- BB engine mnts. whats the difference?

[john@thepier]

I ask whats the difference between sb and BB engine and frame mnts. the reason I ask is this past week I started a job at a engine shop and we ship and store both types of engines on the same cart and I don't see a difference in how they sit. its the same cart and they both bolt up the same.I wonder because many posts for BB mnts for sale here ,and I will probably put a BB in one of my trucks sometime in the future.