Absolutely not. Metres per second is a measure of speed, cubic metres is a measure of volume.
You could just as sensibly compare bees knees with cat's whiskers.
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You cannot. Cubic meters measure volume and square meters measure area. They are not the same thing.
Cubic meters and square meters aren't even the same kind of quantity.
If they were the same, there would be no need for different names.1 cubic meter = 1,000,000 cubic centimeters.
A cubic meter is precisely a 1000 liters, or a kilolitre. Kilo means thousand; a liter is the same as a cubic decimeter.
It could way less, it could way more, or it could way the same. Depends on the pressure. If the pressure is the same in both cubic meters, then the hydrogen ways less than the oxygen.