Renovation of red leather alfa romeo

Hello

I would like to renovate an auto red leather of an alfa gt from 2004.

The blanks are used, so lack of color and some scratches without color.

All the leather veins are dirty on the front seats (remain black rather than red so to be stripped?)

Leather tends to shine little to make it more matt?

How to choose the nearest color?

Is it possible to have a kit for this renovation

Sincerely mr arnould