any way to save / export to other pcb the presets and viewpoint?
No natively implemented way.
The layer presets are saved in the project files, so you may open the files in a text editor and copy the relevant sections from one to the other project. (*.kicad_pro file, section “layer_presets”)
A gitlab feature request for importing layer presets is already open: Feature request: add possibility to import project settings (with fine-grain control) from other projects (#13268) · Issues · KiCad / KiCad Source Code / kicad · GitLab
Not sure about the usefulness for viewpoints - these depend normally too much on the size of the board.