the coolant routing had changed, earlier trucks had both cooling loops involved, 2015's have cut out the secondary system from the EGR cooler.
The coolant ports are the same, but there is a temp sensor that was removed. at first a brass plug was used to block the port, now it seems the hole has been eliminated from the casting.
That's what I've noticed eyeballing new trucks coming in at least.
Couldn't tell you on the DPF either though.