Schneider and Weber were common surnames in Bohemia, especially in border regions.
I have next emigrants of Dietz in my file:
1/ Anton Dietz from Heiligenkreutz em. 1861
2/ Josef Dietz from Běla em 1856
Augustin Dietz, wife Margartha and children Jan Georg, Margaretha and Anna from Stara Hut em. before 1860.
All the best.