RTU32M is a new consept in the RTU world. it is the same hardware if you run 200Mhz or 900Mhz. it is just a license upgrade. All licenses are already preloaded, so again if you want a 61850 server, then you can help yourself.
All you need is a license nr. If you find out you bought a too small RTU, would you rather put a license in or make a new cabinet? it is a no brainer.