Can I use a 97 bonneville for body and other parts on a 94???????

You can...many things body wise aren't going to want to fit 100%. Like the doors are the same under the cladding, the bumper covers and grill are slightly different. Not huge changes and guys have swapped some of the parts around for different looks.

Whats parts can I use from a 97 bonneville with my 94 se.........Can I use fuel pump,ac compressor,and seats???????????

As far as I know, the seats switch over. You could basically switch rhe interiors. Engine bay, not so much.

i have swapped certain parts of my 97 ssei on to my 94 se I.E. deck lid tail lights spoiler grille bumpercovers and ect