Difference between SB 727 and BB 727

The reason i am asking. I am ready to rebuild my trans. All the parts are ready to go. I tore it down last night to find both clutch retainers pretty much smoked. The stator in the pump has really deep grooves too Idk how this thing was going down the road. Didnt feel that bad. A guy down the road might be picking up a 440 with a 727 on it this weekend. He said i could take whatever trans parts i need. Its a 440 and i have a 360

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