> At first glance it appears that GCP has a tighter latency spread (when compared to the network throughput) centered on 0.2 ms

Comparing a distribution of two completely different metrics is not particularly meaningful. You can change the histogram buckets to a different size and it will look just as spread out. When I first read it, I thought it was saying GCP has a tighter spread than AWS. This was confusing, especially since the chart immediately above that seems to have AWS and GCP numbers flipped.