Stereobasic Very difficult to tell without testing! The best way to test is to plug a laptop or something similar to that cable and then charge it, use its OEM software (Vantage for Lenovo, Armoury Crate for Asus, Synapse for Razer etc.) to check how much power is supplied through the cable. If your charger can push 100W but you see 45W on your laptop then the cable can’t send more than 45W. I’ll actually do that with my (3a)'s cable when I return home, then update here…
Edit: I tested with my Anker 736 100W charger; with Razer TB4 cable (the black one) it shows 100W, same as with my Anker 543 cable (too lazy to snap a photo, forgot to include it the first time):

With Nothing’s cable, the one in the package of my (3a), I get 60W, so that’s the limit of that cable:


Edit 2: Nothing but a massive recommendation for that Anker 543, btw. Superb cable in every way. It’s not a data cable though, so no file transfer etc. (that’s why I use the Razer one mostly, also because of eGPU which is connected to my laptop when I’m at home). Feels extremely great under fingers, very durable, very reliable and quite inexpensive (on Amazon DE):
