MMario: a long way back in the thread, but I understand the request for two sets of twelve arrows, "one set for me & one for my friend"
Ideally the two sets will have consistent fletchings so you can check who scored what if a single target is being used.
With two dozen for one person, they can be mixed, as there is no reason to discern which is which, or they can be all of the same pattern.

CHEERS

Nigel