Worth noting perhaps Huitong on his page makes a distinction between both, naming the new unknown missile KD-Y.Indeed. Each strake appears to be composed of two sections in tandem. The forward section is basically a small fin, and the rear section is much longer in length. I wonder if the rear section is foldable... If it is, this missile might be the same as the previously seen missile tentatively designated by Huitong. The image below captures a KD-X right after launch and probably just before the rear sections began to unfold.
Dispensing countermeasures.
Flares and chaff are launched separately?