Daystate bolt O ring question

For my regal xl USA 30 footpouind I ordered these O rings. The closest I could find to the specs.

004 N90 Buna-N Nitrile O-ring Duro 90. Is this the same as .22: -004 Buna-N A90 ????????????????

Is a Duro 90 the same as a A90? Could not find anything A90.


Below is a list someone made on the rings. 

Bolt O-rings (aka Pellet Probe): Air Ranger, Air Wolf, MK4, Huntsman, Regal – FAC

.177: -003 Buna-N A90
.20: -004 Buna-N A90
.22: -004 Buna-N A90
.25: -005 Buna-N A90

Bolt O-rings (aka Pellet Probe): Air Ranger, Air Wolf, MK4, Huntsman, Regal – 12 ft/lbs

.177: -003 Buna-N A70
.20: -004 Buna-N A70
.22: -004 Buna-N A70
.25: -005 Buna-N A70