Nope. Both those other coils are designed for 50v games, they're much weaker than what you already have. The replacement Williams mechs, other than the eos, should have no strength difference compared to the original mechs in blackout.

Modding in extension springs is the only real difference you can make here with the mechs... You won't get a big difference like on flash since Blackout already has newer style mechs compared to the EM ones in flash

I don't get this logic. There's nothing (besides the extension spring) that will make any difference in the play between these old mechs and a wpc mech. If you've already rebuilt the old mechs, why would you buy new mechs? And if you haven't, why spend extra on new, non original mechs? There's no need to put new mechs in a game that already has a single piece baseplate