The model for the Z-Wave Honeywell T6 Pro is TH6320ZW2007. This is a Z-wave PLUS certified, S2 encryption which would make it compatible with your Alarm.com panel.
One thing you should know is that Alarm.com thermostats only work with Alarm.com. If you cancel your Alarm.com subscription, you cannot use it on a different hub.
You may also need to check if you have a C-Wire or if your thermostat needs to be battery operated as the T40K requires a C-Wire but the T6 Pro and the T25 can be battery powered.
Alarm.com Integration
Alarm.com T25
Full integration with the Alarm.com platform - Scenes, Energy Savings schedules, and Pro HVAC Monitoring
Alarm.com T40K
Full integration with the Alarm.com platform – Scenes, Energy-Saving schedules, and Pro HVAC Monitoring
Honeywell T6 Pro
Scenes, Energy-saving Schedules
Communication
Alarm.com T25
Z-Wave SmartStart Z-Wave S2 Authenticated/Unauthenticated Z-Wave Long Range