The simple answer is yes, you could use pork sausage instead of beef sausage in this, but you would end up with a different flavored recipe. Pork sausage is pretty mild and when you're eating it, you taste more of the spices added to it than the pork itself. Beef has a stronger, distinct flavor. So when you cook with beef sausage, you can taste that beef flavor in your recipe. Of course, it's a matter of preference. If you prefer pork sausage, go ahead and use it. Just keep in mind that the recipe won't exactly be the same.