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(a single crystal does not have a dedicated output)
If there sitll are doubts then you need to provide a schematic with exact part numbers and vendors.
It may be possible to connect the crystal normally to one microcontroller (the "master"), and use the oscillator output pin to drive the input of the "slave" microcontroller.
It may be necessary to have a series capacitor before the input of the slave, and a separate DC biasing resistor between the oscillator pins on the slave.
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