It's identical, except for a single line, the RTC select line. I didn't bother connecting that, as the Chameleon has it's own RTC. However, you pretty clearly asked for the possibility to connect a 4-way expander, and that's not possible, as these expanders require two more address lines that you can't get anywhere in the Chameleon - they are known only inside the FPGA.
Ok, thanks for clearing that up for me. I just needed to know if an extender would work as it would open up for using more peripherals on the clockport_v1 core from Lallafa (or Alastair's new agacore if he find a way to include lallafa's clockportfix).