How could I connect a 24 volts gas valve and a millivolts gas valve on separate units so they both shut shut down at the same time or ( connected in seriese or interlock to shut down both appliances at the same time new code in NYC)

Those two type gas valves are not compatible unless you have a relay to work them. If I had a better idea of what you are trying to do I could advise you./ DrTom4444