Oh good! It's nice to have a product you are comfortable with especially when working on new things.
Do you think the dark piping was a previous repair/replacement? It might be the repair work Coach used to do & I am thinking this could be the reason that specific piping is darker. It's a very neat look!
Yes, it could be from a previous replacement of the piping. The thread color matches the original thread almost perfectly, to my eye. But the stitch length shows some variations.