HobbyKing Multi-Rotor Control Board V2.1 vs KK multirotor v 5.5

[satyagupta]

Was reading couple of articles today, found out that there are users who still use the old HK board (the one which comes with Murata Piezo gyros) the T-Copter built by SLS that is also using hk board 2.1, so just wanted to know whats the difference between the HK Board 2.1 and its original version the black board

I mean this one
http://www.ebay.com/itm/KKMulticopter-Blackboard-v5-5-with-config-Aeroplane-/120751367932
vs
http://www.hobbyking.com/hobbyking/store/__19534__HobbyKing_Multi_Rotor_Control_Board_V2_1_Atmega168PA_.html

Can any one shed some lights on this one please thanks

[dreamfly]

Looks the same to me.  Just the colour of the board seems different. Should be identical in flight properties and software.