I have a house with a colour rendered dash on exterior and have had issues with a heating flue which needed to be replaced.
After the fitting of the new flue the heating contractor didn't bother trying to match render which wasn't his job so I had to go back to house builders and was lucky because they were still in the area.
But after I was thinking what if I decided to change a window or do something else which meant altering or damaging an exterior wall will it always be as easy to get a match of colour with this type of finish and blend in the new change.