I’ve been running https://qa.poole.ch/addresses/ch/ since 2017 when the GWR ordinance was changed to allow public access to the address data.

However as the site title says/said, this was based purely on counting the addresses per municipality and not on an actual comparison of the address data. This week I at last got around to improving it a bit and I believe it to be substantially more useful now.

More details here https://community.openstreetmap.org/t/updated-address-statistics-and-comparison-with-gwr-data/114466

Simon