AFAIK the land of Bytom (and together with it) future Katowice were incorporated into Silesia in 1177 by Mieszko Plątonogi (Tanglefoot), duke of Ratibor, who got it as a part of political deal with Casimir the Just, duke of Cracow. Since then Bytom and Katowice were considered part of Silesia.
So it is theoretically possible that Casimir makes some other deal with Mieszko and keeps Bytom as part of Lesser Poland. It might cause a lot of butterflies, of course, so it is not certain there will be any Galicia at all (as a part of Austria-Hungary, I mean - Galicia as a land already existed; the name comes from historic town of Halych in today Ukraine; Austrian emperors extended this name to most of the territories taken from Polish-Lithuanian Commonwealth during the partitions since long time ago kings of Hungary had had a claim to Halych, and Austrian emperors were also kings of Hungary).
Anyway, if there are no butterflies involved; yes, it is possible. When Prussia takes Silesia in Austria in XVIIIth century, Bytom and Katowice are still part of the PLC, so only later they are occupied by Austria as a part of Galicia.