Google Play should work a lot like Game Center in respect to player accounts and binding/retrieval process.
Google Play Login Process for Android:
Step 1: Tap on Google Play Tab from App.
Step 2: Choose the Google Play account you want to use
Step 3: Should Sync to UE Account (it will ask you to confirm the choice).
Step 4: Should give a notification of "Signing In" and take you to a choice screen of "Achievements" and "Sign Out".
Step 5: Account can be confirmed to be "BOUND" by tapping on Character Transfer Tab.
EXTRA: If needed, SIGN OUT by tapping on Google Play tab OR through the Log Out tab.
You can sign back in using the same account originally established OR use another Google Play account by following above steps.
The Character Transfer Tab functions the same way as iOS in having multiple accounts tied to the Google Play Account you establish it on.
Uninstalling the App does NOT affect the loss of the original account established on the device.