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IOTL The Battle of Stamford Bridge (25th September 1066) and The Battle of Hastings (14th October) took place 3 weeks apart. Before Stamford bridge was the Battle of Fulford 5 days before on the 20th, and due to lack of a certain date for landing their troops; lets assume 5 days before Stamford Bridge is when the Norwegians landed their forces in England.
But what if the Norwegians had landed their forces on the 9th-11th of October, or William on the 20th-23rd of September?
Probably no great butterflies (if any) but what would be the resulting events during and after. Would the Normans still smash the Saxons? Can the Northern Earls repel the Norwegians on their own? And if you can manage to get the Normans and Norwegians to fight against each other in a pitched battle, you get a cookie!