Hi @Josele13, I’ve done both successfully with this PPA on different 16.04 LTS installs:
Mate 1.12 -> 1.16 (by newly adding this PPA)
Mate 1.14 -> 1.16 (was already using this PPA from this older announcement)
A 16.04 install with Mate 1.14 likely already has this PPA and will be showing about 89 updates to get to Mate 1.16.
And yes, the 16.04 ISO is at Mate 1.12. Is this making sense?
But one of your questions is puzzling. Do you wish to stay at Mate 1.14? That isn’t as easy as the same PPA that got to Mate 1.14 has made the change to 1.16.