With Gpg4win 4.3.0 installed the check offers 4.3.0 as new version.
See https://forum.gnupg.org/t/check-updates-fails/4366
Check update in Kleopatra seems to check against the Kleopatra version, not the Gpg4win version.
gpgconf --query-swdb gpg4win 4.3.0
gpg4win:4.3.0:c::0:20240125T151456:20240209T092032:4.3.0:20240125T000000:0::
gpgconf --query-swdb kleopatra
kleopatra::?:::::::::