C# cannot explicity convert type

I have two list arrays and want to filter the results from one Array to another but I get a syntax error "cannot explicity convert type '...filtervaluesofattribure' to 'Systems.Collections.Generic.List...' .  How do I do this?  Is it possible to just filter the results back to the same LIST Array?

GetAllConvertedValue = FilteredProducts.Where(i => i.value1 == li.Text).FirstOrDefault();

List<FilteredValuesOfAttribure> GetAllConvertedValue = new List<FilteredValuesOfAttribure>();
List<FilteredValuesOfAttribure> FilteredValueOfProduct = new List<FilteredValuesOfAttribure>();