There is actually a dialog window that pops up which will allow you to keep the settings of the Sprite when you change the source texture.
Selecting ‘No’ will keep your settings, but you will need to modify the collision. As I mentioned, this is expected because the shape has now changed, but you can also change the collision wrapping method. In the example below, I imported and created a square sprite, but then changed the source texture to a pentagon shape.
Tight Bounding Box
Shrink Wrapped
You aren’t going to get the best of both worlds when re-importing a new sprite source texture if the shape changes a lot. Either re-extract sprites and copy over sprite settings, or modify the collision.
Cheers,