Hi,
The differences are:
ASA5506-K9: it includes just ASA IOS. Firepower license is additional.
ASA5506-FPWR-BUN: ASA 5506-X with FirePOWER Svcs. Chassis and Subs. Bundle
https://community.cisco.com/t5/firewalls/asa5506-fpwr-bun/td-p/2626301
I think ASA5506-X w/ FP is the same ASA5506-FTD-K9, it includes Firepower threat defense image.
There is other one ASA5506-SEC-BUN-K9= It includes Security plus license.
Hope it is useful
:-)
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