There were 3 segments in total, so you won't get confused, Alpha had no mask + had short hair, Beta had a mask(the one in the official manga mask) and his hair was quite interesting, Omega had a mask similar to the original, even the hair.

Evening in the lab

Beta:"Hey IL Dottore, when will Bina visit again?"

IL Dottore:"Well I presume she'll visit later on."

Omega:"My my...Well what'cha think about it Alpha?"

Alpha:"I am glad since, we haven't seen her for ages."