Sorry no Snappers belong in a totaly diferent turtle family than sidenecks, the only thing they have in common is that they are both turtles, much like humans and deer so hibridizing is completly impossible. There are 2 animals that are known by that name, one is the new guinea snapping turtle Elseya novaguineae wich is a sideneck very close to the pink belly sideneck Emydura subglobosa, and the pink belly morph of the aligator snapping turtle. Sometimes pink bellied comon snappers pop up also. This "morphs" are very recent and I dont have the sligtest idea on how they look as grown ups. Maybe they loose all their atractive hue And they are normal snappers by all the other means and so they are agressive like a normal one. As for the sidenecks they are relatively peacefull much like sliders in wich they tend to be a bit bullys but nothing major. They dont deserve the name "snapper" like true snappers