I asked when checking in for a recent TAP flight and was told explicitly that only SAS passengers can use the SAS Fast Track
l didn't attempt the SAS Fast Track. However, the CPH Fast Track was much smaller than I recall a few months ago. Granted, a few months ago, it was 4am when l was going through... this time it was with the new set up with the construction and new bridge and all. (I've been flying via BLL and AAR lately) It dropped off such that if you turned directly left after immediately stepping away from your items being released from the security area, you could enter the "perfume free" entrance into the terminal and by-pass the duty free mall.
I don't recall that feature being available the few times I've gone through the CPH Fast Track and regular security.