Can I return the apple pencil if I got the wrong one?

If you bought it from Apple, you can generally return it within 14 days. Otherwise, check the store's policy.

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If purchased directly from Apple, you have a generous 14-day period within which to unconditionally return a device for exchange or refund. If purchased from any other retailer, you’ll have to confirm their returns policy.

If you ordered from Apple, you have 14 days to do a full refund return.