Trying to clone a partition

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If you are not sure how to do, please backup your important data and favorite configs to another disk first before trying dangerous things.

If I understand correctly you want to copy all Manjaro partitions from nvme1 to nvme2, try to follow my points step by step:
(Warning: I haven’t even tried that):

  1. You have 3 current different Manjaro partitions (A EFI partition FAT32, a system partition Btrfs and a swap partition) in nvme1.

  2. Create 3 empty partitions in nvme2.

    1. partition 500 MB FAT32 for /boot/efi when using GRUB.
    2. partition X GB Btrfs for your system and home.
    3. partition 16 GB for swap.

  3. Copy /boot/efi from nvme1 to 1. partition FAT32 in nvme2. I recommend you use rsync to preserve all permissions and timestamps of data. Do not use cp.

  4. How to copy btrfs filesystem from nvme1 to 2. partition Btrfs in nvme2. → Try btrfs send | btrfs receive [HowTo] Copy/Move a subvolume from one partition to another
    you need to copy 4 different subvolumes (@, @home, @cache, @log) to other Btrfs filesystem.

  5. Change UUIDs in /etc/fstab which should match new UUIDs of nvme2.

  6. Run mkinitcpio -P to create current Kernel initramfs and run update-grub for Grub.

I know this is not easy for beginners. I recommend you just install new Manjaro system and copy your data and configuration back. That is easy.