The level 10 will generally be a slight bit lower rate of fire than a level 7 mag, but not by much. The average user won't notice, because at that rate of fire, there are more inaccuracies due to user induced gun wobble than by any slight velocity drop off.
Starvation of a level 10 classic valve is more a result of level 10 bolt stick causing a slower than normal reset than it is function of a slower recharge rate.
Except for the Automag in front, its usually the man behind the equipment that counts.