Waterfall was a whole lot better than nothing. Agile was better than waterfall. Lean was a little better than Agile. Kanban may have been something of an improvement.
-- Uncle Bob, https://blog.cleancoder.com/uncle-bob/2016/07/27/TheChurn.html
How is Lean better from Agile?
I tried a quick search and didn't find an answer.
All I foud is that its origin is different (manufacturing), while its focus is the same (removing waste).