Primeval Whirl is really two distinct roller coaster placed side by side. Since they are completely independent of each other two entries exist in the database. This entry is for the northern of the two roller coasters.
The Primeval Whirl differs from the standard Reverchon Spinning Mouse. The Disney version has 4 additional cars and a "hidden" transfer/service track. Rather than a parallel transfer/service track inside the roller coaster's perimeter, the transfer track is at the back of the ride and moves the trains into a hidden service area behind the ride and out of the roller coaster's perimeter.