Migrating 2 source domains into 1 target domain, all 3 are in different forests, Dir sync question

Hi there,

I am migrating 2 source domains into 1 target domain, each domain has its own forest.

Users from source domains do not exist in Target Domain, so they will be created new using migration sessions.

I will be migrating Users, Groups, Computers and Servers.

I have configured 2 Domain Pairs:

"SourceA-Target" and "SourceB-Target",

I am using in Object Matching for Service Attributes ExtensionAttribute13 and ExtensionAttribute14 on both Domain pairs, (since ExtensionAttribute15 is already in use on both source domains.)

Would this be a problem when Directory Synch is started on both Domain Pairs, since I am using the same Service attributes?