The difference is like between Heathrow and Gatwick.
Breslau Gandau was in the village Klein Gandau, now it is developed and known as Mały Gądów district within the city. Breslau Schoengarten was at the village Strachau, later Germanised to Schoengarten, and now still operational as Strachowice.
It is more less the place, I think.
51.13320881488889, 16.952192901323677