There is no legislation the Army could be sued under that suggests standards between different arms and corps cannot vary. As an example, if this were the case, fat folk could sue for being denied parachute pay as they didn't pass P Coy.
There are stringent laws that suggest that any difference in standards due to race, sex or sexual orintation that resulted in financial penalty could be actionable.
Whether this means that Pte Doris could sue for being denied parachute pay due to her sex is open to a finer legal mind than mine.
On your second point, the MATT 2 (level 2) includes both the PFT and CFT.
As I read LAND/RF/5657, it suggests that the PFT must be attempted (like the old BPFA), with AGAI 67 action if you fail to pass, but the CFT, which is gender neutral as opposed to gender fair, must be passed.