Big difference.. JP5 looks like water.. and is lot more "corrosive"(don't think that's the right term). We used JP5 in our generators and it ate the seals around the fuel pump and injector.. made one hell of a mess but the generator continued to run.
A diesel engine CAN run on JP5 but I think you'd run into a lot of costly issues..
So what is the difference between diesel and kerosine?