Yes, I have those, and they will definitely work. If you want to save a little, look for a pair that doesn't come with a camera remote cable (cable to trigger the camera). The N1/N2/N3/N4 indicates which cable comes with the set, and of course, the only one that works with the K-30 is a Canon C1. But if you don't plan on triggering the camera remotely, you won't need it.
Since you already have a YN-560 III, you could just get a single transceiver to go on the camera:
Yongnuo RF603 N3 Flash Trigger Receiver for Nikon: Amazon.co.uk: Electronics