Running 2 Primary DNS Server on 1 Domain

Network setup is as below:
– NT 4 Domain with PDC over WAN link and a BDC locally.
– NT 4 DNS Server setup locally.
– Recently purchased of Win2k Server. Join current NT 4 Domain.
– My Senior Colleague told me to setup a DNS on the Win2k Server. Told me to put in the same host records as the NT 4 DNS. And configured as a Primary Server.

My question is, is there any implication on running 2 DNS(1 NT 4 and 1 Win2k DNS) server as a primary server in 1 domain?