I had a K2 for a while. While the DR-200 has a twist of 1:12, the K2 is 1:7.9. The DR-300 (in 7.62x39), BTW, uses proprietary franken-mags, not AK mags.
I compared my K2 bolt parts with AR parts, and while they are very similar, none of them will interchange between the two rifles. They do use standard AR mags and bayonets, though.
Also FWIW, the K2 and DR-200 have 18" barrels and AK-style long gas piston actions. The shorter K1A1 (with a collapsing wire stock in place of the side-folder) has a 16" barrel and uses an AR-style direct gas impingement action.
The DR-200 thumbhole stock really sucks, but Ace Ltd makes a pistol grip furniture set for them.
In a nutshell, Daewoo rifles are excellent. If you shared a border with North Korea, you'd make damn fine rifles too.