SQL Server does CU+GDR also install the CU as well as the GDR

I'm trying to determine if the CU+GDR updates installs the CU in addition to the GDR. I think I understand the differences between CUs and the GDR security fixes. And the different paths you can go down, CU or GDR. However, for SQL Server 2019 this site shows SQL Server 2019 GDR (15.0.2125.1 - October 2024) CU28 for 2019 (15.0.4385.2 - August 2024) CU28 + GDR (15.0.4395.2 - October 2024) The KB for 15.0.4395.2 shows KB5046060 - Description of the security update for SQL Server 2019 CU28: October 8, 2024 "To apply this update, you must have SQL Server 2019 or any SQL Server 2019 CU release through this SQL Server 2019 CU28 GDR installed." So it can be installed on top of any previous CUs. Also, this does not list the fixes in CU28, only the GDR fixes. After installing 15.0.4390.2 my version shows Microsoft SQL Server 2019 (RTM-CU28-GDR) (KB5042749) - 15.0.4390.2 (different to the 15.0.4395.2 updates, but this is the September CU28+GDR KB5042749 - Description of the security update for SQL Server 2019 CU28: September 10, 2024) But it does indicate that CU28 has been installed. But, CU28 has never been installed individually. Previous CUs have been installed. And if I try and install CU28 after CU28+GDR it says no updates are required. So my question is 'Does CU28+GDR update install CU 28 as well as the GDR security update?' If it doesn't, the version information is very misleading. And do I have to uninstall CU28+GDR to install CU28? Thanks for your help.