Comment 2 for bug 1797095

Yes, they are *compatible*, but this still make the *combined* work AGPL. This means that any binary version, distributed by the KiCad project or e.g. a Linux distribution, is also AGPL.

https://www.gnu.org/licenses/license-list.html#AGPLv3.0

GPLv3.0, section 13:
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13. Use with the GNU Affero General Public License.

Notwithstanding any other provision of this License, you have permission to link or combine any covered work with a work licensed under version 3 of the GNU Affero General Public License into a single combined work, and to convey the resulting work. The terms of this License will continue to apply to the part which is the covered work,

** but the special requirements of the GNU Affero General Public License, section 13, concerning interaction through a network will apply to the combination as such. ***
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(emphasis mine).