User blog comment:ColeHilton/Satyrs, Fauns, Good Cyclopses and Centaurs, Bad Cyclopses and Centaurs/@comment-3146930-20120217203127

After reading the section of the SoN when Percy sees the army outside Iris' shop, he describes them as having primitive armor or armor made from scrap metal. It is possible these are primitive versions of the monsters. Sort of like how Chiron is better educated then the Party Ponies, then Party Ponies could be more educated than the Roman centaurs.