I did the same thing with my 55G tank. I removed half of the old gravel and piled the new gravel on one side of the tank. When all the old gravel was removed a couple of days later I spread out the new gravel.
Just a heads up if you have any algae problems with your new white gravel it will look slime green in color. I did the exact same thing your doing and I eventually removed the gravel.
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