DUDE.... Mix it into 1 syringe and pin away. What would the point be to become a pin cushion? I've mixed b12 in before too. None of it matters, they all chemically act a specific way when depot into muscle.
Experience and instincts tell me mixing esters is a non-issue, but what about mixing oils? Tbh I may have done this in the past and don't remember, but I usually am using stuff from the same source. Any thoughts on mixing one source's gso aas with another guy's aas in safflower or cottonseed or whatever? Any possible problems there, or another non-issue?