Greetings,
Datasheets are your friend; the 3 end characters are a “function code” and a bit of observation suggests that F99 is code for a locked rotor sensor output. A99 seems to indicate the base model with no added features, e.g. 2-wire.
That “customer code” part would typically indicate a factory customization/modification, most commonly in terms of what connector is used and the order in which the wires are poked in because the world has yet to agree on a universal standard for such things…
The quick & dirty solution for you would be to cut the leads off the old fan and graft your new one onto it, connecting white & black to hotwire the rotor lock feature & tell the NVR that everything is awesome regardless of whether or not the fan is stopped.
Or, if you’re the sort who understands that “until i can get the darn thing replaced” may mean a period of time exceeding the 70K hour expected fan life, buy a replacement with a locked rotor output compatible with the Sunon pattern.
Also, should you desire to learn more about this sort of product, please see this post and those related.