No. Moov HR™ is not designed as a replacement for Moov Now.
Moov HR™ measures heart rate only. The sensor is designed for placement on the head to avoid variance that all wrist based optical sensors suffer from. The Moov HR works with the Moov Now/Moov Classic, which are worn on the wrist or ankle, to provide accurate data on your activity and sleep.
For optimum tracking of your heart rate intensity and activity, we recommend that both devices are worn during the workout.