RX7 allnight

ok the second gens come either with a closed cap RAD or the twin cap RAD
one cap on the waterpump/thermostat and one cap on the RAD
can i put i closed cap RAD on a rx7 that orgiaklly came with a open cap RAD?
i have the neck for the overflow as one overflow goes off the RAD and the other goes off the thermostat/waterpump housing?
can i switch these?
i dont know how to word my sentance? lol i know there could be an easier way to describe it thanks

NZConvertible

You must have one overflow point to the bottle. It doesn't matter whether it's on the radiator or filler neck, as long as you have a pressure relief cap on that point. The other one only needs a plain cap (not pressure relief).