Apps not being pushed to new device
Depending on when you purchased your previous devices, you restored the devices during the initial setup window.

When booting up an Android device after a factory reset, you're greeted with the Setup app.

During this process, you add your Google account. In most cases, there is a link to restore your device, which will install apps associated with the google account to your device.

If you have yet to apply large amounts of data to the device, factory reset it so you go through the initial setup again, and look for a restore option.

If this doesn't show, no previous installations can be found, and you'll have to install apps manually.