If the two Track Packs are calling out the same front spring by part number and tag color there is nothing to gain there, and even if there was I think you'd have to convert the rest of the car to match whichever Track Pack you picked the springs from. Aftermarket springs are out for FS and the 2014-only FSR class; they'll send you to STU, ESP, SM, or CP.
The strut assembly probably doesn't matter, since you're free to swap struts and shock absorbers (there may be some limits - I'm not entirely sure what damper allowances exist in F Street).
'08 GT/5MT (mine)
'10 Subaru Legacy 2.5GT/6MT (hers)
'01 Maxima 20AE/5MT (spare, my occasional winter driver)
'95 626/V6/5MT (still in the family but not at this address)