All these boards run the same chipset, USBizi. So, they work exactly the same way.
The old board you have is not “beginner friendly” like FEZ. Also, it was discontinued months ago. So, if you want to use the board, you are on your own. No support is provided.
I highly recommend you get a FEZ Domino to get you started and then you can use the old board once you learn about USBizi.
To see the differences between the boards, check the schematics
http://www.ghielectronics.com/downloads/USBizi/USBizi-DevSys_sch.pdf
http://www.tinyclr.com/downloads/Domino/FEZDomino_sch.pdf
Do not forget to update the firmware to the latest
Thanks for your quick response and the schematics. I do own a FEZ Domino. Thats the reason why the USBizi DevSys found its way to me. I a struggling a bit with the SPI to adapt a Arduino Siemens S65 Display Shield to the Domino. I thought there were some SPI samples for the old board. Nevermind i’ll keep on fighting and put the USBizi DevSys in my drawer instead of throwing it away.
Yes, do not throw it away. Once you understand what is going on then you can come back to it