Hello, in shim-x64-15-15.el8_2.x86_64.rpm of CentOS 8.3 I see the two files:

./boot/efi/EFI/centos/shimx64-centos.efi ./boot/efi/EFI/centos/shimx64.efi

# ll boot/efi/EFI/centos/shim* -rwx------. 1 root root 1238416 Aug 1 2020 boot/efi/EFI/centos/shimx64-centos.efi -rwx------. 1 root root 1244496 Aug 1 2020 boot/efi/EFI/centos/shimx64.efi

What is the difference? Thanks, Gianluca