Oh I didn't realize you meant just darts together. I assume you mean Dendrobatidae, but it likely doesn't matter between the frogs with toxins. The toxins they possess are all alkaloids and many of them are shared between different species and genera so it probably would not be an issue. I can't say for sure with regards to something like P. terribilis and another species that doesn't have batrachatoxin. Not that you'd have WC terribilis since Colombia hasn't allowed exports in quite a while.