You are correct. AMP appliance came from the Sourcefire Appliance and is normally used for high throughput application. Firepower Management Center config should be the same between AMP appliance and ASA Firepower except for certain hardware related feature like stacking/HA, VPN etc. supported by AMP appliance. and of course, ASA Firepower lives inside an ASA so you can still do all the regular ASA supported features on the ASA5500.