As per my knowledge, I know we can share files between two apps through App Groups developed by the same developer account/certificate.
But here my question is : Can I do the same thing Sharing file between different apps through App Groups with different apps developed by different developer accounts which handles by my own?
The answer is no.
If you create a provisioning profile with an app group my.app.group and extract entitlements from it, you will see that the group is referenced as XXXXXXX.my.app.group where XXXXXXX is your developer ID, so on another account the group will be YYYYYYY.my.app.group and it will be perceived as a different group by any device.
More info: App ID, Application Groups