After it made the Redmi 3s official on Tuesday, Xiaomi apparently felt on a roll and today the Redmi 3X is also a thing. Frankly, this whole naming mess appears to be getting out of hand and if the recent Meizu m3s isn't enough to get you confused, various other makers are also more than happy to provide their own variations on a "3" and and "s" in the title. Oh and then there is the "x" moniker that is also big this year. But, we digress. In Xiaomi's defense, the Redmi 3X isn't exactly new so much as a China Unicom specific version of the Redmi 3s. The specs on the two versions...
Source: http://www.gsmarena.com/xiaomi_redmi_3x_announced-news-18870.php