Mine is I think 510 gallons per hour rated, which is much more than my little generator needs, but it does not seem to suffer from the excess flow. I thought I would have to install a valve to turn the flow down, but I didn't. I wanted to keep the pump the same as my AC's have for commonality of spares, I could of course have just bought the correct flow rate pump.
I'd call Northern Lights and ask how much water flow does my generator need? Then get an AC pump that exceeds that by a little.
I've seen them much larger than mine, and I'd assume your bigger generator would need more water flow than mine, but then it may have a much more efficient cooling
system and may not? So I'd call the manufacturer and ask.
If they can't or won't tell, then I bet you have a Jabsco pump, and with the part number of that pump, you could look up its specs easily.
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