Difference of the two laptops?

What is the difference between that

Lenovo IdeaPad L340-15IWL

Lenovo IdeaPad S340-15IWL

?

Also another question: Are the screen edges of the "L340" under glass (ie the flip-up screen a smooth surface) or are the screen edges protruding? [Hope you know what I mean]

What differences I have seen on the fast now:

Processor: 1.60GHz, 4 cores, 6MB cache / 2.30GHz, 2 cores, 2MB cache
Hard Disk: 512GB SSD PCIe / 256GB SSD SATA III
Bluetooth: Bluetooth 4.2 / Bluetooth 4.1
Graphics: NVIDIA GeForce MX230 2GB GDDR5 / Intel UHD Graphics 610