Here.
One odd thing is that it's copyright 2013.
It lists additional info (on p60) about the three versions:
- Kepler Pro: FSL 6 Cortex-A9 1G Hz; LPDDR2 1G; Android 4.0; 1448x1072
- Kepler: RK 3026 Dual cortex A9, 1.2G; DDR3 512MB; Android 4.2.2; 1448x1072
- Kepler Lite: RK 3026 Dual cortex A9 , 1.2G; DDR3 512MB; Android 4.2.2; 1024x758
(It also confirms that only the Pro has page-turn buttons.)
Addendum: per the Russian retailer site, it would appear that the Pro is the first O-B 6" reader to have a Freescale chip (which previously has only been in the larger readers), possibly because it's the first 6" reader whose chassis (and thus innards) was designed after the introduction of 300ppi screens (all recent 6" eReaders, including the C67 Carta2, have had RK3026 chips).
Full FCC documentation
here.