How to synchronize users who are part of two domain in same forest. The user logon name and e-mail ID are identical

Hi All,

We a forest under which we have two domains e,g ABC and XYZ. Some of the users have accounts in both domains where in their user login ID and e-mail ID are identical. When we tried to sync user some of the attributes are picked from abc domain and some are picked from xyz domain in metaverse

For example for below two ID when i sync First name, last name & e-mail ID are picked from abc domain and object ID & domain are picked from xyz because of this users are not able to register and getting Unrecognized user error.

Can anyone help to resolve this issue. 

abc

First Name :- fimtest
Last Name :- users100
Display name :- users100, fimtest
Logon name :-fimtestusers100
E-mail :- fimtestusers100@*****.com


xyz

First Name :- Testuser100
Last Name :- FIM
Display name :- FIM, Testuser100
Logon name :-fimtestusers100
E-mail :- fimtestusers100@*****.com