It is necessary to disassemble and look, or just to watch the performance of your laptop free.
There is a lot of differences within the same model.
The memory is probably soldered, and a slot for expansion there. Conventional DDR4 SODIMM
Plans instead of hdd to deliver ssd
Any SATA SSD to 2.5 inch.
Plus is the drive to put the old hdd using the pocket adapter
Well, before, when SSD's were very expensive to have meaning is now easier to buy a bigger SSD.