I did a little math of my own, and found that while the ratio of these distances is on the order of 10^15, the ratio of the sizes of these objects is on the order of 10^19.
In other words, Webb is only one TEN THOUSANDTH the apparent size of a galaxy that's a _billion light years away_
[1]: https://mobile.twitter.com/gfish/status/1479339620785524736