Merge 2 domain with same name

Dear friends,

We have 2 domain controller with the same domain name (vnlab.local) but the IP address is different.

IP 1: 192.168.1.2/24 (300 users)

IP 2: 10.2.234.2/24 (50 users)

There is anyway to merge domain with 50 users to the other? we also wanna migrate the the users,group policy object, file & set permissions, computer account, local user profiles...

Thanks & regards,

Quang