You've done it again! This is marvelous! Certainly if the marriage record has Johanna Margaretha's parents' names this will be the clincher.
Regarding Johanna Margaretha's immigration, I found this: https://translate.google.com/translate?hl=en&sl=nl&u...
. She apparently had an older brother named Abraham Gerardus who emigrated in 1872. I have not found him on any passenger list. It could be that Johanna, like Arie van Greuningen, travelled with siblingx?