<image>As shown in the figure, there are three 3x3 grids, each already filled with 9 integers. If adding the same integer to all three numbers in the same row or column is called an operation, then:



(1) Among the three grids below, is there any grid that can make all 9 numbers in the grid become the same number through a number of operations? If so, please indicate which grid or grids they are, and if not, please explain why;
(2) Is it possible for some grids to become completely identical through a number of operations? If yes, please indicate which grid or grids they are, and if not, please explain why.