If I sent Wi-Fi from my iPhone to my iPad, would they have the same IP address?

I don't really understand what IP address is, is IP address the Internet or the device?

IP address is provided by our internet service provider while your device distinguish identity is MAC address. Yes if you send Wi-Fi from your one device to other, both have same IP.

If you have created a portable hotspot with your iphone, and you connected your ipad to that hotspot, then yes. Your ipad will have the same IP as your iphone. IPs are basically digital addresses for Internet connected devices, and are assigned in certain ways. There are internal IP addresses and external IP addresses. It can be complicated from here forward.

Because you are feeding your ipad Wi-Fi from your iphone, you are therefore sharing the iphone's Internet connection which also includes the iPhones IP address.

Lamanet terms: The ipad is sharing the iPhone's Internet connection. So it's the same IP.

Hoped this helped.