If you plan to paint anything in the interior as far as plastic goes, you should paint everything together to get them to match. As old as these are, even if you got the correct color it would still be wrong as these things fade over time.
Your panels look good in my opinion I would just paint them. You can get a paint shop to custom match what you "want" it to be, but trust me, you are going to have to paint all of it.
There are only 2 companies that make replacement panels: Palco (Dashtop) and Coverlay.
ALL Palco panels are black and are painted to what color they use. They are the only place that makes a panel that will accept factory pieces, but they are crap in my opinion
Coverlay (the only one I will sell) uses a thicker ABS plastic, but you cannot use the factory trim on them, they are replacement only panels.
If you want the factory look with the trim, you ONLY option (in my opinion) is to use what you got or find some in a salvage yard. I have access to both kinds, but only Coverlay will be listed as I would actually use them on one of my trucks.