I have the exact same engine and used https://mthtrains.com/20-3116-1 another O Scale Premier 2-6-6-6 Allegheny Steam Engine With Proto-Sound 2.0.
The PFA is not super specific so you can use different roadname engines- just trying to get you the correct chuff and other general details. This is quite common what many of us end up doing- looking for an engine type sound file- not specific to a given roadname. Sure, some engines, the whistle is specific and so forth, but this is kind of where we are forced to mix and match.
https://mthtrains.com/sites/de...hnyvir031020afin.mth