In the unit list sometimes it will say "Armor Piercing". In the game under 'abilities at a glance' it sometimes says "effective against armor". Is there a difference?

For example, Anatolian Hillmen have AP (unit list) and effective against armor (abilities at a glance), but Cappadocian Hillmen have AP (unit list) but do not have 'effective against armor' (abilities at a glance).

Scordisci Elite infantry are highly acclaimed, some say the "best" sword unit in the game. But in unit list I did not see AP ability. Is the unit list accurate on this?

I also see Northern Gallic merc swordsmen, Galatian Shortswordsmen, Southern Gallic merc swordsmen, Galatian "wildmen", & Karian Warband all do NOT have AP in unit list while Iberian light infantry & Apeleutheroi (??) DO have AP in unit list. Is this all accurate?

And I could not find Pezoi Brettioi (Bruttian Infantry) in Unit list. Do they go under a different name & do they have AP ability?