I HAVE RECENTLY COME INTO POSSESSION OF A 2019 SILVERADO 1500 EXTENDED CAB FRAME IN MINT CONDITION. I RECENTLY DISCOVERED MY FRAME ON MY 2008 1500 EXTENDED CAB IS STARTING TO ROT FROM THE INSIDE OUT. AT FIRST GLANCE, THE FRAME SEEMS AT THE VERY LEAST CLOSE TO THE SAME. HOW DIFFERENT ARE THE TWO? CAN I SIMPLY SWAP THE NEW ONE WITH THE OLD ONE?