Yes, you definitely need to try.
For test I successfully update LTS 1.2.2 to the latest rolling
Do you want to continue without signature check? (yes/no) [yes]
Checking MD5 checksums of files on the ISO image...OK.
Done!
What would you like to name this image? [1.4-rolling-202102141111]:
OK. This image will be named: 1.4-rolling-202102141111
Installing "1.4-rolling-202102141111" image.
Copying new release files...
Would you like to save the current configuration
directory and config file? (Yes/No) [Yes]:
Copying current configuration...
Would you like to save the SSH host keys from your
current configuration? (Yes/No) [Yes]:
Copying SSH keys...
Running post-install script...
Setting up grub configuration...
Done.