La 304 loader arms question.

[B6000ME]

I’m trying to determine if the Kabota LA 304 364 and 504 loader arms are the same. They appear to be exactly dimensionally equal and all measurements match. It seems silly that Kubota would build identical arms of different thickness. Can anyone tell me if they are the same arms just labeled differently, with different cylinders?
Thanks

 

[North Idaho Wolfman]

The LA304 and 364 do share the same booms.
But the LA504 is a different boom setup.