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If I can find a replacement shower faucet cartridge that matches the Kerox PB40R model number and matches in appearance, would it be a safe fit?

The bottom of the cartridge that I need to replace has two chambers each marked with a "7".

Cartridge to be replaced

The replacements I'm finding online have a different numbers on them, in this case "4" and I'm not sure if the 7 vs 4 is important

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