Assuming you want to overwrite all the contents of InitialPomChanges with what is in develop (i.e. you want the contents of InitialPomChanges to exactly match develop), do the following:
git checkout InitialPomChanges
git checkout develop . #copies the contents of develop into the working directory
git commit -am "Making InitialPomChanges match develop"
This will make the last commit in InitialPomChanges match the last commit in develop. To make future merges between the two branches easier, it would be a good idea to now do a git merge develop.
Alternatively, if you want to change the contents of InitialPomChanges and do the merge in one single commit, you can do:
git checkout InitialPomChanges
git merge -s theirs develop