Help understanding catalog files changes with software version updates

Below are the files in my Lightroom Classic catalog folder.   I haven't used Lightroom Classic for about 10 months.  In June 2022 I began using it again and updated to Lightroom Classic 11.4 at that time.  I need to understand how this version update affects the file naming of the files in the Lightroom catalog folder.   I see many files now with a v11 added to the file name.  I'm assuming that those are the most recent and applicable files after the software update was done.    I am right about that?   If so what do I do with the two files Lightroom Catalog.lrcat and Lightroom Catalog Helper.lrdata?   Are these files still active?   Can I remove them without a problem?  Should I remove them?   Any insight to how software version updates affect the catalog files would be helpful as well as addressing my questions....  Many thanks