No: one product can only be paired to one account / one email address at one time. If you want to connect your MyKronoz product to another email address, you need first to unpair it from the existing account.
How do I unpair my device from my account?
[iOS or Android users] Open the App, Go to “Settings”, click on “Set up XXX” then tap “Unpair XXX”
[MAC or PC users] Open the software, Go to the “Device Manager” tab, click on “Unpair “ in the right hand-side of the table