That page is most assuredly not comparing apples to apples. The isn't noted at all, it's more of a comparison on peak power usage, which you could maybe use to plan cooling, and a comment on idle power usage.
But you would need to compare total watts for enough systems to get the throughput you need, which I suspect is not the same and is likely workload dependent.
For home use, where you are likely to only have a single system, you can directly compare idle usage, but for Google how many idle systems depends on your thrroughput needs --- and maybe Google can orchestrate shutdown / reuse of idle servers off-peak, so it might be moot.
