The Musketeer and Mouser swashbuckler archetypes from the Advanced Player's Guide aren't supposed to be incompatible, because they don't replace the same things. But currently, you can't take them both.
Mouser replaces opportune parry and riposte, menacing swordplay, targeted strike and bleeding wound.
Musketeer replaces the swashbuckler’s weapon proficiencies, swashbuckler finesse and dodging panache. Nothing overlaps.