I just responded to your post in the other Carousel Inn thread and then saw this one. We stayed in a standard tower room, but I asked at the front desk about the Kids Suites.
There are three Kids Suites--
all on different floors of the tower room. I think they are closer to the front of the hotel (closer to Harbor Blvd) but not positive about that. So that means you have elevator access.
There is one elevator at the front of the hotel and two elevators about midway down the tower building near the pool.
Sorry I can't answer your other questions, but you may want to call the Carousel Inn directly and ask. My guess is that there is only one bathroom in the Carousel Kids Suites while the HoJo Kids Suites have two bathrooms. I would also guess that the HoJo Kids Suites are bigger since they were created by combining two regular guest rooms (including bathrooms), and the standard HoJo rooms are much bigger than the standard Carousel rooms.
(My guess about the number of bathrooms in the Carousel Kids Suites is based on the fact that the View Suites at the Carousel only have one bathroom even though there are three queen beds.)
I would also guess that the Kids Suites open to the outside corridor since
there aren't any internal corridors at the Carousel Inn.
Hope that helps!
ETA: I just reread the description for the Carousel Inn Kids Suites and realized that there is another difference. The Carousel Inn has a queen bed and a bunk bed. The HoJo kids suites have a king bed and a bunk bed (and a sleeper chair/sofa too, I think...though I can't remember for sure). We stayed at the HoJo three years ago in a premium room before the Kids Suites renovations. The walk was not too bad, but this trip, I was very glad at the end of each day that we could just go straight to the Carousel and not walk further up Harbor Blvd to HoJo. DH preferred the HoJo though, so we'll see what we decide for our next trip. We may try the BWPPI minisuites.