Sea Harrier FA2 has the same airframe as the earlier Harrier 1s (AV-8A, Harrier Gr1/3, Sea Harrier FRS1, etc) but with a better engine. So it doesnt turn anywhere near as well as the Harrier Gr7 or AV-8B+. Whilst it can carry 4x AMRAAM, that is all it can carry and has no access to IR missiles or even a gun with that config. It holds essentially the same CMs as the Viggen DI (60 CMs + 320 BOL vs 48 LCMs + 320 BOL)
Only major advantage the FA2 really holds over the Viggen is an excellent RWR and a better radar.
AV-8B+ Doesnt have as many limitations, better turn performance being a Harrier 2 and can run IR + Gun + AMRAAM but it is still sub-sonic which does hurt it and it should have half the number of CMs (though with BOL performance, it probably has more relatively speaking due to the amount of BOL needed to defeat anything). I think its radar is about equal to the Viggen D but it does still have the better RWR.
AV-8B+ is tough because it can turn fight well in a 1v1 fight and isnt limited on loadout, but being sub-sonic vs the mach 2 stuff I imagine really sucks, so it would be the top end of the 13.3 bracket, but not quite 13.7.
Ive only played the FA2 and Harrier Gr7 so basing my opinion on the AV-8B+ via those 2 similar airframes