You are correct that Marni's video is fantastic except you're not seeing the upper level floor plan in that image, which is where the the extra curve is.
Note letter "H" above, this is the mummy room in which the car does almost a 180 turn before proceding into the bug room which is labled "I"
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On Dinosaur this curve is replaced by a straight section where you first encounter the Carno.
Also as previously stated the descent from the 2nd floor to first was slightly tweaked for Dino as well, becoming a more straight section to account for the Pterodactyl scene.
Therefore, as stated above, the track layouts are NOT identical.