Changing your email address should not lose your current profile, points or details... HOWEVER from past observation, it works for some people and for others it doesn't, sometimes creating a new account with the new email and, in some cases, preventing access to the old account... and then Oracle cannot merge accounts, they can only fix the email to the old account for you manually.
See Dude!'s User Guide:
So as you said its not guarantee to have same profile, if we loose everything then its really bizarre... I hope it will be fixed very soon.
1.3 Changing Your Username
To change your username, which is your e-mail address that you use to sign-in to your Oracle account, click on Change Username, located next to Change Password as previously described.
Currently, changing your username may not work properly and give you a new system assigned public username handle with 0 points. You can however change back to your previous username and thereby restore your rewarded points and account status.
Somehow i got approval from my employer and i can see in support.oracle.com as approved CSI.
But still am unable to access to the My Oracle Support Community with the message "Access to this place or content is restricted. If you think this is a mistake, please contact your administrator or the person who directed you here." , Can you please let me know where can i post the question related to My oracle support community in order to resolve this issue?
There's an email here: Community
Also, if your MOS admin is not within earshot, you can send a message to them asking for access from several places under the Settings tab of the MOS page. Not that, as an administrator, I can see where to grant MOSC access, I think it is entirely controlled by MOSC admins.
From what I understand, the merge of OTN and MOS accounts was something that was available only during the merge of the communities. You cannot merge the accounts by aligning the login credentials yourself.
Your username handle and login ID (email) have to be unique within the system. if you rename your login or username handle to something that already exists in the system you should receive an error message. If you initially had a login for MOS that was different than OTN you end up with 2 different user accounts. And as far as I learned from MOS support, these accounts cannot be merged.
If you have a different email address for OTN and another one for MOSC, at the moment both won't be merged. Speaking from personal experience, you can't have the same username(or handle , like in your case CKPT) in both OTNC and MOSC. And if you would change the email address, it would end up with a new user-I have experienced it just about 4 days ago.
You may want to read this thread.