The effect you are seeing is caused by low texture resolution, not a difference in the model itself. By default 3DS Max only displays textures at a maximum resolution of 512x512. To raise it, click on the plus sign in the top left corner of a viewport and go to "configure viewports..." There you will find the controls to raise the maximum texture sizes to match your models textures.
the difference in the rendered view on the other hand is probably related to the harsh default lighting in Max compared to the softer lighting in photoscan. Adjusting the lighting should give you the same results.