Hello @defaultj1a70n9l6fdo
If you are a paid user with the Lightroom Mobile subscription, your presets should sync to all your devices. Be sure to sign into the same Lightroom account on each device.
If you are using the free app, images and presets do not sync across devices. If you can not restore an iTunes/iCloud backup of your old iPhone onto your new device, you must re-import the presets on your new device.