What gets brought into the hobby as B vagans might just as well be a completely different species.
Take for example the recent revision of Acanthoscurria - what we thought is Acanthoscurria brocklehursti is actually Acanthoscurria theraphosoides and the current hobby Acanthoscurria brocklehursti might just be the real Acanthoscurria geniculata.
So when it comes to hobby specimens that look similar (B vagans, B angustum and B sabulosum) you will need better tools to identify them. You cannot just use the colours and how it looks.
Do I make sense? LOL
Dont be scared of the Penguin
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Sooo many spiders in the hobby are just a mess. Dimitri, the other day when i said i have sabulosum on the BTS facebook site, a few people said "But there are no sabulosum in the hobby..." Just making me even more deurmekaar. Our vagans looked just like your 1st one, till she matured then she turned pitch back. but other strange one,.. our vagans male was always pitch black..but now with his maturing molt his carapace and short hairs on the legs all turned gold.. weird. Hobby vagans...and we dont realy know what it is. probably hybrids of many similar looking Brachypelmas..
@Dimitri: Another thought occurred to me...isn't it only the female tarantulas that have visible spermathecae? How do you ID the males then? I apologize if this is a difficult question - I'm just curious