If you dont paint all of the pieces you may find it doesn't match. Not because the color match is off but because it seems the red lacquer darkens over time.
I painted my red interior in 2004, I recently replaced a door and bought 65 red interior lacquer to pant the interior of it and it didn't match, it was too bright. I did however still have a partial can of the red that i used in 2004 and tried that... Nope it as also too bright but a perfect match to the brand new can.
65 coupe 5.0L/5 speed
2001 Lightning #1757