Plum Crazy paint code(s) ?

When I bought my 64 A100 it was pained Plum Crazy purple. It needs some touch up. I do not know what the paint code is/ was there more than one Plum Crazy code .( I do not think that it is the modern challenger version of Plum Crazy)
Also since I do not know what type of paint was used...acrillic enamel ? base coat clear coat ??? will it matter what type of paint I buy to spray a small section on the vehicle ?
As you can tell I'm not a painter.
Do paint stores have a portable paint color spectrograph thing to take out to my vehicle to check the actual color ?
Yes, Most auto paint stores can shoot yours with a gun and get a very close match.