I dont advise you to change anything about the EFI partition.
#PARTITION IS NOT SUPPORTED STELLAR DRIVE CLONE SOFTWARE#
So a big thank you to AndyMH for creating this userfriendly Foxclone software Clonezilla, which is often advised by others, is way too complicated for regular users. A free and especially a user friendly image software program was really missing in the Linux world. Foxclone gets really good reviews on this forum. Only 2 days ago I discovered the existence of a new (user friendly) image program called Foxclone, which I will try to use myself quite soon as well, because it seems to be really user friendly from what I have read about it, in the step by step guide on the Foxclone website. But that's a question of trial and error. I dont know for certain though if the hardware on another computer will conflict with the boot options of your current computer, because EFI can cause conflicts, there have been written quite a few posts about that problem on this forum. You simply have to clone the entire disc, with all the different partitions (including the efi partition). And I didnt need a separate partition to boot from, because a single partition with a Linux OS on it, can be bootable by itself as well, as it is in my case, whereas 1 Linux OS on 1 single partition is THE bootable partition itself and handles ALL the booting options for all the other Linux OS during startup. The standard LinuxMint program "Disks" is perfectly capable of cloning an entire disc. I guess you'd need a fouth partition for boot, yes? I didn't think it (edit "Disks") was capable to cloning a whole disk.