Hi there, Luciano!
I am pleased to report that yes, the pool area at
Disney's Animal Kingdom Kidani Village is equipped with lockers and wet/dry dressing areas.
There are two restrooms for gentlemen, one behind the pool bar, and another to the left of the entrance of the pool area, just before the stairs. before you go down the stairs. This restroom does offer a single large shower.
You'll want to keep an eye on the line for the facility, because if multiple want to use the shower, you might find yourself waiting in a line.
More showers are located in Kidani Village's adjoining fitness area, but you will likely need a Key to the World for access. If you explain your between-Resort predicament to a Cast Member, s/he can opt to let you in to use those showers, particularly if there is a queue to the single one.
Have a great stay!
See you later, celebrator,
-Deborah B.