how can you tell if pokemon card is first edition

how can you tell if pokemon card is first edition to Spot Pokémon Cards 1st Edition Base Set Cards:

Name: how can you tell if pokemon card is first edition to Spot Pokémon Cards 1st Edition Base Set Cards:
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SKU: 23674386914

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Playing in Standard is exceptionally different from playing in Legacy, to the point where it's sometimes hard to believe the two formats are part of the same game

how can you tell if pokemon card is first edition to Spot Pokmon Cards 1st Edition Base Set Cards:

this subscriber sent me these SICK Gold Metal vintage Pokemon cards, check it out

I can see the colors are more vibrant on the JP versions, however, I wonder if its consistent or variation in printing I want to see more for comparison