Depends on what you take as your baseline. The original Müsli is overnight oats with some added fruit / some nuts.

Ah okay, I just looked at the picture and read the brief description of cold oats left overnight and assumed they’re the same thing. If that’s not the case then I’ve definitely never heard of muesli before today.

I think overnight oats aren’t that far from the original musli, but many people think Müsli is lower-sugar granola which is not the case