The two tutorials prob'ly do pretty much the same thing... Set-up the USB drive to boot the Knoppix ISO.
The difference appears to be what OS you are using to set-up the USB drive. In the first, you're using Knoppix. In the second, you're using Windows, hence the downloadable BAT files. I didn't look at the BATs to confirm that, though.
The persistent install appears to create a /home on the USB drive. You could prob'ly do so from either way you "installed" Knoppix. Since you have an 8GB drive, you could create a small (800MB) partition to hold the ISO and boot files, and a large partition to hold your persistent home data.
Just so you know, the only thing persistent is the home data. You would be booting the same ISO everytime. You would have to remaster the ISO to make any changes to the OS.