public static void ShadowCopy(object a, object b)
{
    if (a.GetType() == b.GetType())
    {
        PropertyInfo[] properties = a.GetType().GetProperties();
    
        foreach (var p in properties)
        {
            var value = p.GetValue(a, null);
            if (value != GetDefault(p.GetType()))
                p.SetValue(b, value, null);
        }
    }
}

public static object GetDefault(Type type)
{
   if(type.IsValueType)
   {
      return Activator.CreateInstance(type);
   }
   return null;
}