For starters, this argument shows you total lack of understanding the relevant physics and chemistry. This will most certainly add lots of weight to your posts in alternative fuels.

Additionally, if this was your intended way to weasel out -- you should've known it better. Often, it's much simpler to admit a mistake -- be it carelessness or misunderstanding than trying to come with some backdoor excuse built on quicksand.

As for the shemistry, just because N2O and N2 both have 2 N, that doesn't say much about how they behave. They're very different gases in most respects. N2O is also different from the other nitrogen oxides (often just collectively called NOx) that it cannot be made directly from nitrogen and oxygen; instead, it is normally made from some other compound such as NH4NO3. (ammonium nitrate)