It's always possible that you might have to move, but OKW has a good track record of keeping people in the same room ..... as long as they know about it. If you haven't already asked that the reservations be linked, you can do that. Also, when you check in, discuss it with the CM who assists you. We've had to still go to the lobby to pick up new keys on the day of the switch.
The Turtle Pond area has the largest pool of the "non-Hospitality House" areas. It's known as a quiet pool......not exactly an accurate phrase. It's a basic pool. It is also the only other pool with a Snack Shack, although it seems to be open for only a few hours a day (maybe you'll find it open longer in Aug) and doesn't have the variety of the one at the HH. You can refill mugs there during the time it's open, but otherwise have to go to the HH. All buildings in the Turtle Pond area are within a few minutes walk of that pool.
It's pretty easy to get from Turtle Pond to the HH. There's an Internal Bus, but we always jump on the very first bus that comes along (and verify that the driver is planning to stop at the HH). Turtle Pond is the 3rd of the 5 bus stops at OKW, so it's usually a 5-7" ride to get to the HH. HH is the final stop before leaving OKW. When you're ready to return from HH to your room, walk across the street from the HH to the first bus stop. Board the first bus that comes along, and it's 5-7" to get to Turtle Pond area. Or you can walk!
[When you return from the parks, if you want to go to HH before you go to your room, just get off at the first bus stop and walk across the street to the HH. No need to ride all the way around the resort.]
Hope you have a fantastic trip!