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This is a standard 24 volt thermostat loaded with options.
You can use any 24 volt thermostat as long as it matches how many stages you have.
If you could tell me what terminals have wires in them I could be more specific
Also, this is a case where the thermostat is LABELED as a American Standard/Trane...but is actually a Honeywell.
See the link here and notice the Honeywell on same page