I am building vyos iso for crux branch with customised kernel as mentioned in https://wiki.vyos.net/wiki/Rebuild_VyOS_kernel_Step#VyOS_1.2.x But in finally build iso I am seeing two config files in directory /boot/
vyos@vyos:/boot$ ls
config-4.19.106-amd64-vyos initrd.img System.map-4.19.106-amd64-vyos vmlinuz-4.19.106-amd64-vyos config-4.4.113-amd64-vyos initrd.img-4.19.106-amd64-vyos System.map-4.4.113-amd64-vyos vmlinuz-4.4.113-amd64-vyos grub