https://semiconductor.samsung.com/dram/lpddr/lpddr5x/k3kl3l30cm-mgct/
and
https://semiconductor.samsung.com/dram/lpddr/lpddr5x/k3kl9l90cm-mgct/
Seemingly identical specifications, same prices on aliexpress, but maybe they have different timings?
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They are probably made in different factories or with different machines