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Its actually i little bit trickier then that.

A codex, dataslate, supplement, or whatever is going to include the 'datasheet' of a particular unit. Datasheets should identify what faction to which the unit belongs. When they don't the faction is the name of the codex the datasheet is published in.

Currently there are no codex's that include a datasheet that is not for the faction the codex is named for, but it is technically possible.