Even if you used the same paint there will be a minor difference in the black.. They are two different textures and surfaces.
I have heard a favorite for hard tops is Rustoleum Hammered Black.
I used this to paint my frame, bumper, wheels and mirrors.
After the completion, when examined carefully, the paint adheres to different surfaces differently. My wheels appear to look like a really dark/metal gray. My bumper looks glossy black and my mirrors look perfect.
There's no way to 100% get around this.
As far as which color to use- you can google Painting my hardtop and find a lot.
Some people use Rhinoliner or Herculiner or Raptorliner or 49er