They are actually the same (gnome-terminal), but with different color schemes.
If you have the Unity desktop, first create a new temporary user and login with it into Unity. Run a terminal and close it. Now log off and access GNOME with your regular user again. Open a terminal and run these commands:
sudo rm -rf $HOME/.gconf/apps/gnome-terminal
sudo cp -rf /home/tmp-username/.gconf/apps/gnome-terminal $HOME/.gconf/apps
tmp-username with the name of the temporary user you just created. After running the command you can delete this user. Run gnome-terminal again and now you should see the Unity style.