Will parts from an 05 Cobalt fit an 08 impala

There is no huge list or database that will cross reference all parts on all cars. Your question is too general. But you can go online to an auto parts site and look up a specific car and part to check if that part will fit other vehicles. But to say which ones, will require some time and effort,

There's bound to be some minor parts that will swap but like Dolby said, you would have to reference a specific part to know if they're compatible between the two models. Otherwise, you are talking about swapping parts between two different models, one a compact and the other a mid size. Not many parts will swap.