Time for a RAM upgrade?

I’m currently using a laptop that’s about 10 years old.
“ACER ASPIRE E1-531”
CPU 1.9 GHZ
RAM: 2 x 4 GB - DDR3L PC3-12800 (800 MHz)

I recently picked up a second laptop that’s roughly 3 years old.
“HP 15-rb031nm”
CPU 2.2 GHZ
RAM: 4 GB - DDR4-2666 (1333 MHz)

Since this newer machine has a faster processor, I want to swap the memory from the old one into the new one. Before I start tearing things apart, I need to know if the RAM sticks are physically compatible in terms of the pins.
I know someone will just tell me to open them both up and check, but the layout on this newer model makes accessing the RAM a bit difficult.
If anyone here knows their hardware, I could use some help.

Well, you see, DDR3 and DDR4 are two completely different beasts altogether, so I guess it just wouldn't work.

Honestly, it’s getting ridiculous—everyone is constantly getting their hands on new laptops or tablets, yet half of them can't even find the damn power button...

Where is this stuff being handed out?

Alexander Diaz4 said:Seriously, everyone’s getting handed these laptops and tablets, yet half of them can't even find the damn power button...

Where are they even handing this stuff out?

I've seen it firsthand: I'm standing in line, waiting for the giveaway... and when I finally get to the front?
Nothing. Just swiped my card and walked away...

Never got a single thing. Honestly, maybe it's for the best—I don't want to deal with some cheap junk... or if it actually is good, it probably just ends up costing me twice as much in repairs later down the road...

steelhawk26 said:I realize some people might tell me to just open them up and inspect the memory sticks manually, but the real issue is that accessing the specs on these newer models is significantly more difficult than it used to be.
If anyone here actually understands this hardware, I am asking for your help.

Badejo hit the nail on the head: DDR3 and DDR4 are fundamentally incompatible. Even if you were dealing with two different sticks of DDR3, their clock speeds wouldn't match up anyway. You'd better stop overthinking this and just rip them all out.😛