linux headers

hi, I have some questions about the compilation process which I am not familiar with. #1 using ArchLinux PKGBUILD, I recompiled the LTS kernel with a slight change introduced in the block/blk-core.c file and two files were generated : linux-lts-6.1.15-1-x86_64.pkg.tar.zst and linux-lts-headers-6.1.15-1-x86_64.pkg.tar.zst. on the other hand, I had previously compiled packages that used linux-lts-headers-6.1.15-1-x86_64.pkg.tar.zst : do I have to recompile them after the change ? #2 my host kernel has been upgraded to 6.1.19-1-lts : how do I compile to 6.1.15-1-lts from 6.1.19-1-lts? regards, lacsaP.