I have come across a 2011 130 that was fire damaged. My Td5 chassis has seen better days, could the 2011 chassis be made to work with my current 2000mdl Td5 as a replacement chassis?

Today started up the Defender and heard a bit of a clunk, oil light stayed solid, turned it off. I found a small piece of black plastic on the dipstick. Any thoughts, Do I have big problems!