If it is damaged, it needs to be repaired. Generally, it is painted as a whole, because it can avoid color difference and transition interface.
If only the damaged part is sprayed, the black and white color is fine and can't be repaired (the interface can be looked at carefully or professionals can look at it a little). It is difficult to ensure that other gorgeous colors will not appear color difference, because it is difficult to ensure that there will be no color difference due to the influence of paint mixing level and spraying method. Once there is color difference, it will be ugly, just like a big patch. It is better to spray the whole door, at least it will look more comfortable.