Colormatching paint to Sanwa 'dark blue'

I'm working on a project and I really like the hue of Sanwa "dark blue" buttons/tops.

How difficult is it to match colors? I only have a Lowe's nearby, would I be able to bring a button there and get the right color or would I have to attempt to mix paints to get it? Or ideally does anyone know an online store that sells a color close to this?

Intending to paint a case and maybe some small plastic parts.

Also side question: how identical are the Qanba balltops and washers to the Sanwa color? Cause those are alot cheaper on FA it seems