Will two 8GB sticks run in dual-channel mode?

Yes, as long as you put them in the correct slots (typically slots 2 and 4, or 1 and 3 — check your motherboard manual). Two sticks of the same capacity almost always enable dual-channel mode. Speed and timings don’t have to match exactly, but both sticks will run at the slowest stick’s speed. Just avoid mixing memory generations (DDR3, DDR4, DDR5) or incompatible voltages.