I have spiderlings of both B. albopilosum and B. vagans as well as a large juvenile B. albopilosum. The tarantula in that picture looks just like my spiderlings (which range from about 1-2 inches) after a molt. Their coloration is quite stunning! My large juvenile doesn't get that same brightness after a molt so I assume yall are going by pictures of adults that you've seen. B.vagans have a much blacker carapace and legs with the red setae on the abdomen. But remember, same genus--so they might look slightly similar!
But remember, same genus--so they might look slightly similar!
I agree with KG. To make matters worse, there were hybrids of these two species on the market not long ago. Cronoss and I recently got several adults from another hobbyist who was getting rid of his entire collection.
B. vagans has a creamy white outline of the carapace and much richer black color (similar to G. pulchra), especially post-molt. I will try to get a picture of my B. vagans that just molted yesterday to give you a comparison.
I've also noticed on my curly spiderlings that the hair on the abdomen is much less curly than the hair on the legs. Curlies aren't really all THAT curly-haired.