I have an idea although I am not very expererienced with 2CB, I think I tried half of one of these blanks lately but might have been something else!
I have however taken a lot of MDMA and have had massive differences in effects of MDMA that are not just set and setting or isomers or whatever, it to me appears that even when someone makes anything be it spaghetti bolognese or lasagne, they can make it differently and although the outcome is still spaghetti bolognese or lasagne it isn't to say it always tastes the same!
Sometimes I have had MDMA that is psychedelic, other times lovey or sensual or flooring or really clean feeling etc etc This is not to say it wasn't MDMA all those times and most would have been in a similar set, setting and mindframe its just to say its different MDMA, that I would guess is from a different producer.
I don't think many people on here from how little 2CB you see will have taken lots of different batches of 2CB, not like they would have done MDMA anyway so maybe we are just starting to realise what I mentioned above is the same for 2CB. Nothing is ever the same, somethings made in similar ways would have almost exact similarities but other things can appear different but essentially be the same thing.
I remember a thread about LSD earlier this year in which this was discussed and people were putting all the differences down to set and setting and not different quality of LSD or chemist, whatever. I think everything can vary and when you make anything (even a fucking sandwich) it won't always turn out the same!
Now I hope these 2CB pills do be come as widely spread as they seem as I might find some down our local club, mmmm beer boys and slags on 2CB instead of shitty pills, could be interesting! But at least that way i'd get some