implied is DEFINITELY not the same type as dee, or even his mirror. She doesn't actively give a shit about socionics in the same way that dee does. As she says, she doesn't fire out all these tests and theories like dee does; neither at the rate he does, or at all. She's far more likely to just get involved in discussion if she feels like it.
I'd be prepared to say that she is an SEI and that dee isn't. dee I actually still think is a type who is strong in Ne. I think he values Ti, even if he's no good at it. I don't think implied cares about Ti at all, nor do I think she's strong in it.