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The only reliable way to tell is to make a measurement of the actual stiffness/Young's modulus. I rely on the long-grain stiffness to determine thickness, but that's just me. There are good and fairly simple ways to get that number, and we've talked about them a lot.
Failing that, WRC is usually less dense and stiff than spruce. you'd be on the safe side making this top about 10% thicker than a spruce top that worked out well for you. If it's a particularly light piece, leave it a little thicker.
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