if it's fix/fix, then it's a loose ball.
if it's fix/free it's most likely a SB. (i've never seen a fix/free loose ball pro max)
otherwise the visual differences are really subtle.

the SBs dust covers are more rounded, the loose balls' are flatter.
or measure the axle diameters. The SB's are 9.5mm front and back, the loose balls have a 9mm in front and a 10mm in back