what a beautiful couple!
the canon of post 13 is made by Cornelis ouderogge in 1649 and is in the Rijksmuseum in Amsterdam. There are so many similarities that it is certainly possible that the couple is made by cornelis Ouderogge as well.
There is not much known about these small cannons, were they merely used as signal guns ? I do not know. More likely is that they were gifts given to a commander after some great victory or made as a prototype for a bigger cannon by the foundry in oder to get a large order.
I have a few small cannons in my collection, of course not so beautiful as the ones you have posted

I will try to post some pictures later.
best,