PCM3070: the difference between PCM3070 and TLV320AIC3254

Part Number:PCM3070

Hi,

Recently I find out that PCM3070 is almost the same as TLV320AIC3254, what i find the difference is that AIC3254 has MicBias function. is there have any other difference? I am also curious about these 2 parts, they RTM at the same month, revised at the same year. are they for different application?

thanks!