How to retrieve google play games ID with the new updated Google play games Gamer ID?

I have used Google play unity package for google play Service sign In. Using the profile ID(generated at sign In) I have identified the users.But as of now,the updated google Play games generates new profile ID(which starts with 'g') for the same User.Is there a way for me to identify the old profile Id using the updated Google Play Games Gamer ID.