Left: Flashable with a USBasp programmer (capacitor to the left, 8X4 pin AtMega chip)
Right: Flashable with a Silabs toolstick programmer or Arduino programmer (capacitor centered, SiLabs based)
Both are ver 3.1 Plush 30.
More info here on how to flash a SiLabs based esc:
http://oddcopter.com/2012/07/18/flashing-silabs-escs-with-blheli-firmware/
http://www.rcgroups.com/forums/showthread.php?t=1686498
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