I did a Nano job in a particular code facing West. This was in their neighbours garden. The neighbour then asked me to an adjoining wall which faced South in the same colour code.
They complained that the two walls was a different shade. Little did they know I did theirs with the left over from their neighbours.
You will not get two seperate walls in the same ral code, one facing South and one facing West looking the same when one is in the shade and the other in the light. She accepted the reason, apoligized and all is forgiven.