You could be lazy and just use the old Magisk'ed image but you'd miss any improvements in the kernel and at worst it wouldn't work.
I don't use Magisk but make modifications to the boot image, /vendor and /system and patch SELinux policy. The biggest job is verifying the compatibility of the the binary patches I've made previously. Once I've done that and verified/altered addresses, patching the boot image takes a minute, patching the file systems takes a minute. Total time: less than an hour.
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