Yes it is. Old Gutnish is usually seen as an additional dialect of Old Norse. I've only had a few courses about Old Norse, that were mainly about Old West Nors

Yes it is. Old Gutnish is usually seen as an additional dialect of Old Norse. I've only had a few courses about Old Norse, that were mainly about Old West Norse, so I'm not really an expert in this topic. I think we pretty much know the differences between Old Western Norse and Old Eastern Norse through the texts of that languages that were preserved.