If it is four-layer board, and the inner CORE size is correct, then if the thickness of the PP can make up the difference exactly, then after the surface of the copper erosion it can re-do the lamination , this principle is not to exceed the upper limit of the principle of product specifications. of course, the size of the board will have differences, but still produced within tolerance as long as they can be implemented. If it is over the 4 layer pcb, you must still confirm the internal dimensions is right, as long as the external PP have differences, then you can follow the four board operating procedures again, the size of the same considerations are in principle of not exceed the upper limit . Above is for your reference.

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