For many people there is not much difference between tyres and they think why change from a SUV summer tyres to a SUV non-studded tyre in winter season. They both look black and round are made of rubber. What they do miss is the fact that they have been designed for different use, they are not at all the same tyres. The winter tyres have a rubber mixture that will remain flexible at minus temperatures, which a summer tyre will not.
So to stay safe during the winter season you will need to put on those approved tyres, even if you go for a non-studded tyre. With a tyre that has been approved for winter use, you can drive safely, which is not the case with the summer tyres.