Man pages matching name systemd.syntax in section 7:

systemd.syntax.7.en	debian 10 / systemd
systemd.syntax.7.de	debian 11 / manpages-de
systemd.syntax.7.en	debian 11 / systemd
systemd.syntax.7.de	debian 12 / manpages-de
systemd.syntax.7.en	debian 12 / systemd