896 has also RX 460, right?
Right. Some of them. 
However, my personal feeling is that 460's 896 is not exactly the same as 560's 896... So 14-15MH/s should be possible, but depends on exact memory type...
I didn't say it's impossible. I just said I've never seen that. Have you ever seen 560D cards with ~15Mh/s?