Yeah they both do have it in the example I gave and as a result it is not close to being "twice as much". It is a bit more and that is all.I was assuming 14 con. Also, if one can have false life, both can have it. I see no reason their defenses would be different.
The thing is as levels get higher more and more spells become available so you never will get to where it is a lot more. At 11th level you can get contingency and put even more hitpoints with false life under a contingency. So then it is 85 with an 8 con or 105 with a 12 con.
I agree more hit points are always beneficial, but the benefit is not big, it is small, almost miniscule if you are talking about a 2 or 3 point difference in constitution score.
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