Group2D : AddObject Index Stable

If you have a Group2D and over the course of time AddObjects to the Group (let’s say 4 objects) using

AddObject

Is it certain that the first one added is index 0, the second index 1, the third index 2, and the fourth index 3?

So if you subsequently

RemoveObjectAt(2)

Are you are confident that the object removed was the third one added?