Git: fusionar un compromiso en una rama diferente

So I have 3 branches;

• develop - my continued development branch
• version_1 - a release branch
• version_2 - a release branch

I had to do a hotfix on version_2 to reship that version, it was a 2 line change in 2 files, very small.

I wanted to apply that fix to version_1 e develop.

So I;

git checkout version_1
git merge <commit checksum>

I thought a commit only contains the changes, so would only apply those. But the merge conflicts because it tries to update all the changes between the two branches.

Is there a way to merge/move/apply ONLY the changes in a small commit to other branches?

I could just manually re-implement the hotfix on those branches, but this seems a lot of hard work, especially as more hotfixes may need to re applied and rolled out to all other branches.

Cheers, Will