Yes it's one line, but it has two versions with big differences. I could be wrong but it's not just the screen size, it's also the screen resolution and camera

Yes it's one line, but it has two versions with big differences. I could be wrong but it's not just the screen size, it's also the screen resolution and camera resolution as well. They might as well be two different products. Everyone thought that the smaller iPad Pro was the successor to the iPad.