@stev0
Have never come across Outback specific coilovers in NZ (only seen guys in USA talking about them). They're only ever labeled BL/BP, the way I see it when they're talking about OB specific, they would be referring to the spring rates not the design of the strut.
With adjustable damping and ride height my thoughts are that having the exact/correct spring rate wouldn't alter the performance greatly (my opinion/thoughts only - open to discussion).