Okay. This may sound confusing to some of you.
But IRL, the sun doesn't supernova. It's too small. It only expands and then just ejects all of it's gas leaving a white dwarf.
In US2, all stars supernova! Every single one no matter what happens and then creates a black hole.
When I collide a sun it supernovas.
IRL it would probably create a big gas explosion. But nowhere near as violent as a supernova.