How can I use two WhatsApp accounts with the same number on different devices?

 Yes! This can be done in two ways,
The first method is pretty easy, here it goes
Method1:
1. Install Whatsapp on your first device and make sure you have finished all the setups.
2. In your second device, Install chrome browser and in options enable "Request desktop site"
3. In your chrome, browse to WhatsApp Web and follow the instructions to get connected.
4. After establishment of connection, click on options and enable the notification.
5. Chrome will prompt with confirmation of notification, click accept
6. Done!! You will receive notification when messages arrive.