Git: Merge a Commit into a different Branch

Merging only one or a few commits mean using git cherry-pick

First cancel the merge you just did: see "Undo a Git merge?".
Then:

git checkout version_1
git cherry-pick <commit checksum>

That can apply to multiple commits or a range of commits: see "How to cherry pick a range of commits and merge into another branch".

You need to cherry-pick those commits.

Switch to the branch where you want to add the commits:

git checkout develop

Then, cherry-pick the commit. First do a git reflog and get the SHA-1 of the commit of the hotfix.

Then, while you are on the branch develop, cherry-pick it

git cherry-pick <commit SHA obtained above>

Perform similar actions on the other branch version_1.