NGFW is FirePower services, and the ASA w/ FirePower is the ASA and FP module together.
http://www.cisco.com/c/en/us/products/collateral/security/firepower-4100-series/datasheet-c78-736661.html
http://www.cisco.com/c/en/us/products/collateral/security/asa-5500-series-next-generation-firewalls/datasheet-c78-733916.html
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