If the sandpaper has a 'P' in front of the grit number, like P1000, it is the same grit as abralon. If the sandpaper does not have the 'P' in front of it, it is probably the US ANSI standard, so:
P360 = ~300 ANSI
P500 = ~340
P1000 = ~550
P2000 = ~1100
P4000 = 1500
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