Is 70-316 difficult than 70-315

Hello everyone I passed my 70-315 (Web Application development using C#) exam last week and going to start studying for 70-316 (Windows application development unsing C#). I have few questions regarding this exam : Is 70-316 is difficult than 70-315 ? How much preparation time will be required to prepare for 70-316 after passing 70-315 - given that I have done ADO.NET and Security for 70-315. Looking forward to hear views from all. Thank you. C_sharpkid.