Will feng shui multi-layer exterior wall tiles affect interior wall tiles?

There is nothing particular about feng shui, the most important thing is collocation. I recommend you to use alto.

Warm colors are not resistant to dirt, giving people an impetuous feeling, and cold colors are easy to feel old when they are dirty.

External wall tiles are small in size, so it is unrealistic to mix and match, which is time-consuming and material-consuming. So you'd better mix colors.