Spain was ruled by the Arab Umayyad caliphate in Cordoba, before the state fragmented into smaller sultanates, only to be swallowed by the nascent powers of a united Castile and Leon. The last of the Arab rulers of Seville, Abu Abdillah (Boabdil) was driven to the Alpujjaras and later into exile during the time of Ferdinand and Isabella. And of course, westerners refer to the Arabs from the Maghreb as Moors. So it's not with some irony that when they landed in the PI, they found people sharing Boabdil's faith, hence the term Moro (correct me if I'm wrong, that's how I understood it).
So I think while proper display rules might not allow weapons from two distinct cultures be displayed or attributed to the same category, the poor curator probably mixed up one Moro with another
