Fi Nano Partner's cannot share Fi Nano microchips with other vet/rescue/breeders as there is no way to transfer the microchips ownership from one Fi Nano Partner to another.
Once a box of Nano microchips have been purchased, they are automatically registered with the contact information of the vet/rescue/breeder who purchased the chips. This contact information will be used as an additional point of contact if the pet were to get lost and the pet's owner is unresponsive.
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If you have already shared microchips with another vet/rescue/breeder, you (the the original Fi Nano Partner) will have to get the pet's information and register the chip under your account. See: I am a Vet/Rescue/Breeder, How Do I Register A Fi Nano Microchip For a New Owner?