Fortunately this editor has been more consistent than many are.
Your decision to braille separate parts is the wise one.
In general, all dynamics, slurs and nuances apply to both parts. You may notice that when both notes are on one stem only one nuance mark is shown, but when there are two stems, the nuance is marked for each stem. There are occasional places where the parts have different articulations (measure 28 in Example A, for instance), even when the notes are on common stems. Such occurrences will be fairly rare.
I hope this helps. Let me know if other questions arise.
Cheers to you.