Different thickness or board in tub area?

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I am installing waterproof board in a tub area. I noticed that the waterproof board has a different thickness than the existing drywall at the top of the enclosure. Is this going to create a problem when I tile? should i then tile just to the end of the waterproof board and not onto the drywall? or install the waterproof board all the way to the top to the ceiling?

waterboard is thinner than drywall

drywall thicker than waterboard

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