Esta es la información que pude conseguir
Ram
Redmi Note 3 = LPDDR3, 933Mhz.
Mi4 = LPDDR3, 933Mhz.
Mi4s = LPDDR3, 933Mhz
Mi5 = LPDDR4, 1333 y 1866Mhz
Camara
Mi4 = 13 MP, f/1.8, autofocus, LED flash,*1/3" sensor size, 1.12µm pixel size, geo-tagging, touch focus, face/smile detection, panorama, HDR, 2160p@30fps, 1080p@30fps, 720p@120fps.
Mi4s = 13 MP, f/2.0, phase detection, autofocus, dual-LED flash,*Geo-tagging, touch focus, face/smile detection, panorama, HDR, 1080p@30fps, 720p@120fps.