The ones in the video look the same as the ones I had in the Morrison’s £40 pack from 2013. I’ve seen another video of the rockets from last years £50 pack and they look more like the ones I’ve got.
Seems like it’s luck of the draw with those rockets.
The two bigger cakes in there have around 140-190g each. Then you have a 100 shot missile cake (about 40g?) with the Catherine wheel and the 4 rockets which probably have around 12g each. With the 2 fountains included in that I can’t see many of those pieces being anything special.