ummmm una diferencia podria ser que

El RAid BOSS tiene penalizacion de lvl : es decir si le llevas 8lvls o mas te mete skills de penalizacion si le llevas 8 lvls te mete silence si le llevas 9 te mete anchor

y el BOSS no tiene ninguna penalizacion

otra seria

que el RAid boss dropea items que son crafteables o comprables
y el BOSS aparte de dropear cosas k tira el raid boss tira un drop de BOSS k son joyas unicas, solo las tiran cierto boss y dan bonus extras

lista de BOSS

Queen Ant: Ring Of Queen Ant:
MP+21, 60% increase in resistance to poisoning, increase in accuracy, increase in critical damage, and 40% increase in resistance to hold.
B grade, Mdef: 48

Orfen: Earring Of Orfen:
MP+31, 40% increase in resistance to bleeding and increase in the amount of heal.
A grade, Mdef: 71

Core: Ring Of Core:
MP+21, 40% increase in resistance to poisoning and increase in accuracy.
A grade, Mdef: 48

Antharas: Earring Of Antharas:
MP +31, 80% increase in resistance to bleeding, increase in the amount of heal, vampiric rage effect, 60% increase in resistance to stun/silence, decrease in MP consumption, and increase in resistance to earth-type attack.
S grade, Mdef: 71

Valakas: Necklace Of Valakas:
MP+42, 80% increase in sleep resistance, HP +445, decrease in reuse delay, increase in P. Atk. and M. Atk. wild magic effect, damage shield effect and increase in resistance to fire-type attack.
S grade, Mdef: 95

Baium: Ring Of Baium:
MP +21, 80% increase in resistance to poisoning, increase in Accuracy, increase in critical damage, 60% increase in resistance to hold, and increase in Atk. Spd. and Casting Spd.
S grade, Mdef: 48

Zaken: Zaken's Earring:
MP + 31, 60% increase in resistance to bleeding, increase in the amount of heal, vampiric rage, and 60% increase in resistance to stun/silence.
S grade, Mdef: 71

LISTO CREO ME QUEDO MAS COMPLETA