Is there an intelligence/huge personality difference in Cockatiel species???

[rivx]

The different colors of cockatiels aren't a different species -- they're just different color mutations, different genes. I think of it like a human with blonde hair and a human with brown hair, although it is more complex than that lol. I agree with what was said above. Personalities are always individual, and life experience can sometimes shape them. A little time to warm up might make them more confident, or they might just be more on the independent side. Both are fine.