As long as you are at it, insure you connect the w5200 pin 45 (pwdn) to a digital pin (pin 9?) on the Arduino. Then we can put the w5200 in "power down" mode. Maybe a weak pulldown resistor and a jumper/switch/breakable trace on that would be wise. On the power down pin, power down mode is HIGH.
Does the w5200 shield from ekitzone use the pwdn pin? If so, maybe you should use that pin on the Arduino to set some type of compatibility.
It seems like I am building a substantial wish list. 
edit: I found a closeup of the ekitszone w5200 shield. It uses digital pin 5 for the pwrdn pin and has what appears to be a breakable trace.