B5 and Q1 both have more red in them. I'm pretty certain that's K1.
When mixing paints such as Lesonal or Sikkens that don't use a binder, it's nearly impossible. The best bet is to mix up 3/4 of a gallon and hope like hell you can tint it back to the right shade after adding metallics or pearls. As I'm sure Restoman can tell you, tinting is a pain in the first place; having to rectify an altered formula after adding metallic or pearl absolutely sucks. The customer to which I had to issue a refund said his customer wanted the red metallic/pearl to have a lot more pearl in it, but he wanted single-stage paint (cheap bastard). I told him to find a different color--I said it wouldn't work, but I tried anyhow and I've been tinting paints many years. The beautiful dark red his customer had picked came out looking like a stripper's toenail. It was pink, and that was U-Tech which uses strong toners and a binder.
I issued the credit because he was a great customer, and the poor guy had to sand the entire car for a repaint, but before he could do it the asshole owner pulled the car out of his shop and brought it elsewhere. Resto's favorite customer--"Just work on it when you can," but when it's not done in a month he's pissed.