Here is the original Ps4 SOC in 18*19mm =342mm²
Chipworks' measurement of the PS4 chip is 348mm^2. I'm not sure where you're pulling the 342 from.
Please use the SATA Port as reference point
I don't know what reference size this is supposed to be.
edit: make sure you're not counting the epoxy resin at the edges as well, makes it trickier given the low resolution. I've used 95 x 63 pixels for the chip. Unfortunately, the right side of the chip is potentially obscured.
edit2:
The Cypress CYUSB3312 chip there appears to be QFN (exposed leads on the 4 edges, whereas BGA would not have those), which is 10 mm x 10 mm @ 44 x 44 pixels, which leads me back to the results I got with using the DDR3 chip as a reference.
95 x 63 pixels -> ~310mm^2
100 x 63 pixels -> ~325mm^2 (if the chip extends into that red part a few more pixels)