carshape & gpx question

can you use carshapes from v1.13 to work in gp3 2000,im sure i seen a thread on it before but cannot remember?.also on gpx 2.20,the option of adding physics,can i use physics that ive used on v1.13,will they give roughly the same performance and laptimes?

when i put a physichs file on gpx2.20 the game didnt work but i used advanced physichs editor. It worked