It seems I might have made a mistake. The drones I saw do not possess winglets or ventral fin but I didn't notice neither does GJ-2 possess these features.
From Henri K blog
[Zhuhai 2018] GJ-2, the new PLAAF attack drone that is derived from Wing Loong II, is being prepared after being transported to Zhuhai by an IL-76MD. However, we do not know why they fill it with kerosene (?) When it should not be demo
Here is the video address