Hi there KuKulzA28,
The pieces fired in the first video certainly look authentic to me, saw similar items in museums so i suppose they could be antiques, but i don't know for sure...
Since the title of the second video is "Cannon made from junk (Lantaka)" i doubt they are original, maybe reproductions to lighten up celebrations as some type of fireworks.I believe lantakas also were used for that purpose in the old days.
If you are a registrated member of YouTube (not me) you can contact the person who posted the video, perhaps they know more...
Have a nice weekend...