Datagram question

I was using Windows 7 for the client and Windows 8.1 for the Server. I’m on the same machine now. Having looked a bit closer it seems the hex data dump I’m receiving is larger and different, but the data size is the same, so I’m a bit stumped by that at the moment. I thought using the Datagram would work ok, but maybe I need to do proper serialization.

Cheers,