I just copied my whole root partition to a new Laptop over netcat. It still has close hardware (Intel CPU, no extra GPU, etc.), but some differences in interfaces etc.
Things one might have to consider:
/etc/fstab will need to be redone
All interfaces changed, so network configs may need to be updated
Other programs relying on hardware or paths that don’t exist anymore need to be updated (eg. conky did not work due to i8k being not supported, other interface ids etc.)
But literally nothing that would break anything. Because Arch is usually installed manually, one knows what needs to be cared for, what could break or could cause certain issues.