Only if the version is marked as a fork: neptune-core/CHANGELOG.md at master · Neptune-Crypto/neptune-core · GitHub (0.8 is not, so no need to update unless you want the other new features)
Actually, this (other than the backup) might not have been needed in your case, sorry. I should have asked you to just try running the new version directly on the existing data (after the backup of main).
Anyway, the steps I showed I have found useful to start completely from scratch from a new seed phrase / wallet.dat. (Related topic (IMHO unfortunate wallet design inspired by Bitcoin Core): What are the practical steps to regenerate a wallet using --import-seed-phrase? - #5 by aszepieniec )