In our application we have several places where users see a list of items and can add, edit or delete an item.

![enter image description here](https://i.stack.imgur.com/Kco3x.png)

For some of these lists adding new items is probably the most frequent used functionality whereas for others it's editing existing items.

Would you keep the order of the buttons consistent throughout the application (no matter which use case) or would it be good to have the most frequented button on the left (which is depending on the use case)?