There is no color realistically that you can do a "stick match". ALL colors should be sprayed out and cleared (if they are a BC/CC).
Today, with the waterbornes, you had best spray them out and clear them! HOLY CRAP that color is miles different without being fully dried and cleared! No more brush touching that's for sure!
Before I had a mixing machine I had a bunch of pint cans with toner in them to tint. The paint shop is usually thrilled to give them to you because you won't be bothering them as much.
I am fascinated at the guys I have worked with who will do a spray out card and it matches, then spray the car and it doesn't and blame the paint.
The fact that it doesn't match now and it did then is the EVIDENCE that you aren't treating that spray out card with as much respect as you should. It needs to get sprayed out EXACTLY as you spray the car. Same distance, speed, overlap, flash time, EVERYTHING has to be exactly the same.