It depends on which grading system is used for the "1000 grit matte" finish.
Abralon and Siaair used the FEPA of European grading system. So their 1000 grit should always be preceded by a "P" to make it clear what you're talking about (or use "Abralon"or "Siaair" after the number.)
90% of the time these days when we says 1000 grit we are using the FEPA system and the grit is usually created with an Abralon or Siaair pad. The green, maroon and grey Scotch-Brite pads are/use the US/CAMI grading system. Their 1000 grit CAMI= 2000 grit FEPA (or "P2000 grit").
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