Eighteen footballers have worn both of these shirts. BVB Buzz counted every last one a while back.
Most of those names barely register on the Südtribüne now. These five still do, so Saturday will sting in five different places.
1. Robert Lewandowski
Lewandowski left for nothing. He gave the club four years, a hundred goals and change and two league titles. Bavaria got him on a free in 2014.
Free. The Südtribüne has never quite got over that bit.
He went on to break Bayern's scoring records and to punish his old employers whenever the mood took him. Sentiment was never his problem.
2. Mario Götze
How do you come back from that? Götze was a Dortmund academy boy who left for Pep Guardiola's Bayern as the most expensive German footballer in history.
Three years on, he was back. The line at the time was that he wanted to win over the people who weren't welcoming him with open arms. Illness and injury made that harder than it should have been, though a cup and a Supercup arrived ahead of his move to the Netherlands.
3. Mats Hummels
Hummels is the strange one. Everybody files him as the ultimate Dortmund defender, which conveniently skips the fact that Bayern raised him.
One senior appearance in Munich was all he managed. The loan to BVB that followed stuck.
He captained the Klopp side, won everything worth winning in yellow, let his contract run down and headed back south anyway.
And he came home again. Süle's emergence had cost him minutes in Munich, so he walked back through the Dortmund door and carried on. Only Michael Zorc has played more games for the club.
Dortmund forgave him, in other words. Almost entirely.
4. Niklas Süle
Süle came the other way. Supporters cheered that free transfer out of Bayern in 2022.
Nobody has ever agreed on what the four years after it were worth. Süle retired this summer. The argument never got settled.
5. Raphaël Guerreiro
Guerreiro gave Dortmund seven seasons at left-back. His contract expired in 2023 and Munich took him for nothing.
Another one die Schwarzgelben didn't get paid for.
Players aren't the whole of it, mind. The worst betrayal here never kicked a ball for Bayern at all.
Matthias Sammer captained BVB to a European Cup. Dortmund adored him for it. Sammer went on to run Bayern's sporting department, where he oversaw the raids that carried Lewandowski and Götze south.
And the man in the home dugout? Niko Kovac won a domestic double as a Bayern player. Marcel Sabitzer made the same trip in 2023 and is still on the books.
None of that will buy either of them a second of patience if Saturday goes badly.
Verdict: Lewandowski remains the one that hurts, because he left for nothing and then spent eight years proving exactly what Dortmund had handed over.
Add us as a preferred source on Google