Well they are both web browsing battery life benchmarks. If loading different web pages shows 5+ hours of discrepancy then yes from a user standpoint they are precisely meaningless.
No, it might mean that one of the benchmarks is meaningful and the other is not. Or it might be that they test different scenarios and could be useful to different groups of users.
What the discrepancy tells you is that there's something odd about the benchmarks that could stand to be better investigated/explained.
Ok, but they're not the same thing. Odd might just mean a different set of underlying assumptions that cause the numbers to misalign, or perhaps a bug.
