Regarding the Android application, we transferred the application according to the following URL.
The app transfer itself worked fine, but when I tried to upload the apk file of the new version of the app from the developer console with the intention of updating the app after that (with a new account), I got an error saying that the keystore is different. I got out and couldn't upload.
* The keystore is newly created by the transferee (we).
Is this the only way to use the original keystore itself (the keystore of the application transfer source) even after the application transfer?
You have to use the original keystore.