Dueling
Source: Advanced Player's Guide
Aura Faint transmutation; CL 5th; Craft Magic Arms and Armor, cat’s grace; Price +14,000 gp.
Description
This ability can only be placed on a melee weapon.
A dueling weapon (which must be a weapon that can be used with the Weapon Finesse feat) gives the wielder a +4 enhancement bonus on initiative checks, provided the weapon is drawn and in hand when the Initiative check is made. It provides a +2 bonus on disarm checks and feint checks, a +2 bonus to CMD to resist disarm attempts, and a +2 to the DC to perform a feint against the wielder.
Dueling-FG
Source: Pathfinder Society Field Guide
Aura Moderate transmutation; CL 7th; Craft Magic Arms and Armor, cat’s grace; Price +1 bonus.
Description
This ability can only be placed on a melee weapon.
A dueling weapon bears magical enhancements that makes it particularly effective at performing certain combat maneuvers. When a dueling weapon is used to perform a combat maneuver that utilizes the weapon only (see below), it grants a luck bonus equal to twice its enhancement bonus on the CMB check made to carry out the maneuver. The dueling weapon also grants this same luck bonus to the wielder’s CMD score against these types of combat maneuvers. These combat maneuvers include disarm and trip maneuvers, but not bull rush, grapple, or overrun maneuvers. If you’re using the additional combat maneuvers in the Advanced Player’s Guide, this also includes any dirty trick maneuvers that utilize the weapon, as well as reposition combat maneuvers, but not drag or steal combat maneuvers. Note that this luck bonus stacks with the weapon’s enhancement bonus, which in and of itself adds to CMB checks normally.
Was this just an oversight in creation and are both legal for PFS?
The bigger question here is if Dueling (Field Guide) also works on Sunder.
Which I'm 99% sure it does.