Directory synchronization for groups

We have requirement of synchronizing 2000 groups between two forest (Say Target Company and Source Company). All 2000 groups are already present in target company with same name. We want to include these 2000 into our QMM synchronization scope. If we include them, will this affect the existing membership of group in target company domain ? 
For example: Group1 in source company has user1, user2 as its members. Group1 in target company has user1, user3 as its members. If we enable QMM synchronization, what will be outcome? Will it be Groups1 (user1, user2, user3) which will be our desired result or Group1 (user1, user2 - by overwriting current membership) ? 

Thanks in advance.

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