I have two working copies of the same project, each switched to a different branch. Is it possible to merge local changes in one project to the other working copy?
If your changes include deletions, using GNU patch won't cut it. If you want the changes committed to both branches, commit them in one, then svn merge those changes to the other branch. If you did the changes in branch A and need them in branch B instead, svn switch your branch A working copy to branch B.