No, Stream 9A is Stream 9 with Audirvana Studio server inside.
Stream 9X is Stream 9 with plugin card so user can choose Audirvana, LP10 Nuprime Edition variation, and possibly other streaming platform when available. A good streamer regardless of platform needs good power supply, SRC, digital I/O and chassis.
There is mechanical and design challenge, and then licensing and certification issues to create a flexible platform. Therefore Stream 9X won't be available until next March.