Can I colour Wax Finish Varnish to match a particular wood?

Yes you can. By using Polyvine Acrylic Colourant.

This range of 25 concentrated colours and wood tones are inter-mixable, so you can mix and match to your required colour. They have super high quality pigments, specifically formulated to give superior colour saturation. Polyvine Acrylic Colourant can be used with many waterbased products including varnish, scumble glaze, stain, emulsion, glue, filler, masonry paint, tile grout and cement.