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Splash Marans have been known to lay a lighter egg than other Marans but their egg should still be very much different from that of your other birds. You should be able to tell.
eta: I know nothing of hatchery birds, but I would be leary of a Marans coming from a hatchery. That is just...
Your DH can tell the difference between a Welsummer and a Brown Leghorn by looking at the earlobes. Welsummers do not have WHITE earlobes, Brown Leghorns do.