Replacing DC running exchange with DC with same name and IP

I currently have a 2003 DC running Exchange and Certificate services (RPC over HTTP enabled for Exchange). Long story cut short, its broken or keeps breaking..
I would like to replace the DC with a new Server but need to keep the Same computer name and IP address as well as move all the Exchange data from old to new.
I have read many posts about replacing a DC, which I have done before reasonably successfully, but I’ve never moved a DC with Exchange, especially running RPC.
Any help would be greatly appreciated.
Current Server is 2003 Standard, with Exchange 203 Standard
New Server will hpoefully be 2003 R2 and Exchange 2003.
Yes I have a fully Backup Exec backup of the exchange store.