Yes, it's a kit with liquid malt extract. Best before June 2020, so oxidised.Do these kits use liquid malt extract? If so, I would guess the one of the left was old or got oxidized.
Was the brown one, brown from the start? Meaning, did it had the same colour in the fermenter or was it a slow, long process, across a few weeks?
Sudden agressive browning can be noticed with NEIPAs. Is your kit a NEIPA? If not, then the colour could be a direct result of ingredients used ( maybe mislabeled ) or / and process.
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