Don't worry about Kingmaker. No narrative connection
Apart from Tristian's single comment about the Worldwound and all the badness going on there, no? But otherwise - yes, it appears to be entirely separate.
There's also a kingdom problem...
...in which you send troops to the Worldwound to support the Mendev Crusaders against the demon invasion. So the two games happen at around the same time, which sounds like DAO and DA2.
"We make our choices and take what comes and the rest is void."
