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Hey -Resetting your second Ledger Nano X to factory defaults will not affect your first device. The first device will continue working as-is with the original recovery phrase. After resetting the second device, it will generate a new recovery phrase. Remember to safely store this new recovery phrase as it will be needed to recover your second device if necessary.
For instructions on how to reset your device to factory settings, you can refer to this link: https://support.ledger.com/hc/en-us/articles/360019095214-Reset-to-factory-settings
Please note that any assets stored on the second device under the original recovery phrase will not be accessible with the new recovery phrase. Make sure to transfer any assets to a secure location before resetting. Feel free to ask any more questions that you might have.