To the OP’s question: I’m pretty sure Oberlanders say Sim Shalom at mincha but Shalom Rav at maariv, while Yekkes say Shalom Rav at both. Oberlanders and Yekkes come from around the same geographical region, right?
Minhag Ashkenaz goes farther back than the Chasam Sofer in many areas, but in others he is relied upon.
Joseph, I’ve also read (possibly elsewhere in the Coffee Room) that Oberlanders have become very similar to their Chasidishe neighbors. I assume the OP was inquiring about similarities between Minhag Ashkenaz and the pre-Chasidishe-influenced Oberland Minhag.