Does cold air and warm air have the same air pressure?

the cold air pushes the warm air up and forms cumulus clouds

Yes, high pressure systems are associated with warmer air.

It has more molicules....

The gases air consists of are roughly described by the formula pV=nRT, where p is pressure, V is volume, n is the number of molecules/atoms, R is the gas constant and T is temperature. As the...

It depends on the altitude. Taken normally at sea level, warm air has lower pressure than colder air at the same altitude.