They are the same thing. It "adapts" TTL serial connection to USB so your computer can communicate with an arduino, raspberry pi, or in this case the PS3's SYSCON. Never mind the jargon, we just need it to plug into the PS3's brain.
An RSX/CPU delid is absolutely necessary for every backwards compatible model. If you don't, it will just overheat and YLOD again. So watch videos, make a dlid tool, and work up the courage. There's no getting around it, it has to happen!
Okay, yeah you have a 2-3s YLOD. I immediately suspect an RSX issue, since that tends to be the leading cause of non-instant YLOD's. BTW the Tantalum fix was a originally reccomended for randon YLODs that only occured in intense gameplay (which are more likely to be due to the filtering caps)...but he wasn't very clear about that in the OG post. So your confusion and everyone else's is totally understandable. It got me too!
Go ahead and remove the top shell and blue ray drive. Under the blu ray is the leaf spring that applies pressure to the GPU (the little bastard accused). Press down firmly with your thumb on the middle of that spring. This will compress the motherboard into the fan assembly and against the bottom of the case. It'll apply more pressure to the RSX and possibly reconnect a BGA defect (cracked solder ball, detached ball from cold solder joint/pad, and other related issues). Flip the pwr rocker and try to power on, while keeping firm pressure on the RSX. If it boots (stays green for longer than 3 seconds), then you need a reball. This is know as the pressure test. There could still be a BGA defect if this doesn't work, but it definitely confirms one if it does. Anyway it's a free test, easy to try. Just don't put all your weight into the pressure. Maybe 10-20lbs of force is plenty. If you have a BGA defect, sorry! That's the end for you I'm afraid. The tools and skill needed are more expensive than a working console.
If it doesn't make any difference then we'll walk you through the SYSCON tutorial to get the error codes (once you get the USB adapter). That should give us more to go on. A 3034 error code is the one we don't want to see. That's an RSX issue requiring a reball. Other codes might give us a clue where you shopul;d probe with a multimeter to look for open fuses or shorting caps. If it's not that simple then you could be in more trouble. If you need to replace an IC (chip) then you'll need a hot air station and a donor board. If you need to replace an HDMI port, you'll need hot air + preheater + Good HDMI port. So you're going to need to figure out what's worth fixing and what isn't, based on how much time & money you are willing to spend.