You will definitely have to call. That being said, just because they are in SkyTeam doesn't mean that they are available for reward redemption. One cannot book a reward flight on KQ using OnePass miles. I'm not sure if CZ is in the CO system for redemptions yet or not.

As for pricing, I think that CO is more expensive than that for a redemption within SE Asia. Depending on whether you get an itinerary that is a Series 8 or 8B you could be paying either 25K or 50K in Y for a standard reward. I'm guessing it is an 8B because of the partner flights, making it 50K. On NWA you can get the flights for 20K, assuming they have loaded CZ as a redemption partner.