Model Number : ZE551ML 
Processor : Quad Core, 2.3 GHz
Memory: 4GB RAM, 64GB inbuilt
Display : 5.5 inches, 1080 x 1920 px 
Camera : 13 MP Rear + 5 MP Front Camera

Model Number : ZS570KL
Processor : Quad Core, 2 GHz
Memory: 6GB RAM, 64GB inbuilt
Display : 6.8 inches, 1080 x 1920 px 
Camera : 23 MP Rear + 8 MP Front Camera