can you sync 2 apple watches with 1 iPhone

You can but it's time consuming > How to use multiple Apple Watches with your iPhone

You can use two watches, but your iPhone can only be paired with one Apple Watch at any given time. To switch between watches, you would therefore need to first unpair the watch that you are currently using and then pair the other one.

The Apple Watch app on iPhone takes backups of the watch automatically, including a fresh backup when unpairing. Each time you re-pair, you can restore the watch from backup during set up. Most data and settings will be restored, with some exclusions: cards used for Apple Pay on your watch (which would need to added back manually), calibration data, synced playlists and passcode.

More info:

Unpair your Apple Watch and iPhone - Apple Support

Set up your Apple Watch - Apple Support