How To Tell If amiibo Is First-Run Or Reprint

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How does one tell the difference between figures made during the first-run of a specific amiibo figure and a reprint of it? Are the tells character-specific or consistent across all figures? Also, I'm looking for differences both on the figures themselves and the card (packaging) and photo proof would be great.
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Differences between 1st and 2nd print Amiibos
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Images: Eren Li, Ketut Subiyanto, Ketut Subiyanto, Karolina Grabowska