Yes, you can use DDR4-3600 at 3200 speed.

It’ll work fine. The RAM will just run at the slower speed your CPU supports. Grab the 3600 kit if it’s cheaper or on sale — you’re not losing anything.

The motherboard and CPU will negotiate the speed. At default settings (no XMP / DOCP), it’ll likely boot at 2133 or 2400. Then you go into BIOS and either set XMP to a 3200 profile, or just manually set speed to 3200, timings to something safe (like 16-18-18-38 if you’re not sure), voltage to 1.35V. Done.

32GB is no problem either. Two sticks of 16GB each is the sweet spot.

The only real risk is if you try to force the CPU to run the RAM at 3600 — that’ll likely not boot or be unstable. But if you’re intentionally running it at 3200, you’re golden.

Just make sure the specific kit is on your motherboard’s QVL list if you want zero hassle. Even if it’s not, 95% of the time it’ll work.