They've been about the same several times already if you watch coinotron.
coinotron does not fit for me.
had two miners running at same speed, one on bitcoin and one on i0coin when it said i0coin was 1.30 efficiency. After about 6-8 houres (don't remember for sure) i compared the btc value i mined with the i0coin exchanged to btc value. (not considering the fees comming up at that moment)
While the difficulty for i0coin in that time did slightly change, and while the whole mining time the efficiency was between ~1.30 and ~1.50 depending on the actuall trading price, i noticed that i had about 2 times the BTC mining bitcoins then mining i0coins and trading them.
So for me the "efficency" values definitely don't fit. Maybe that i had just "unlucky" shares, but the income in i0coins per time was at several tries much lower than it should have been according to difficulty / efficiency displayed.