We are renovating three bathrooms, all with dark grey 600 x 600 floor tiles, white 300 x 600 wall tiles laid vertically, and a feature wall with textured subway tiles laid vertically.

In the ensuite, the feature tiles are white (blanc), in the main bathroom they are palest pink (rose), and in the powder room they are palest green (vert). https://www.equipeceramicas.com/en/portfolio-item/la-riviera/ 

My question is about choosing a grout colour and whether it should be the same colour for the wall tiles as for the feature wall tiles? The feature tiles are textured and have slight colour variations (ie. not all one single shade), as you can see in the link. I'm thinking of using the Ardex misty grey. Any advice would be great! Thanks.