The Lion King is massively larger than Tiana. The ride building occupies a 148,000 square foot footprint. Roughly twice as large as Tiana (though to be fair that isn't including some of the exterior queue space). The full land for Lion King though is around 327,000 square feet.
I once made an overlay of the attraction as well, using a fairly accurate scale. Should have posted it in this thread. If they did a 1:1 clone of it, it would need quite a lot of land.
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And just in case anyone wants to play around with the template. This is more accurate to the real thing too. I altered the walkways somewhat to fit within this space and connect to the existing AK walkways.
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