It seems your splitting hairs here??
I say this because even if you used Pro Spray for example,.. You spray it.... then I spray it..
Very easily could be different shades.. Based off of temps, humidity, air pressure, gun speed and distance etc..
So one base you settle on, could end up not being the shade your after when all is said and done possibly
Do you have anything other than pictures to compare? Then models?? If that is exactly the shade, have you had it scanned?? Otherwise I think its almost chasing your tail. I dont say this to be negative, I simply am looking at it from a different perspective than maybe you guys are??