Help with US AP Mine M2

[MINENAZ16]

Hello,
I need clarification with projectiles of bounding mine M2 series.
I know 3 different projectiles (60mm mortar modified proj.).
Are these projectiles interchangeable ? Does the Mine designation "A" change depending on the projectile shape ?
Regards

 

[US-Subs]

I've never seen any documentation that indicated so. I think I've seen a couple more variations, with the exception of the center one in your photo our understanding was that they were not modified bodies so much as unfinished or rejected bodies. There could be a document somewhere that clarifies this, if you find it please share.