Yeah, I misplaced my power cord, and I'm wondering how bad of an idea it would be to use my 15w amp's power cord with my 50w Valveking 112... probably terribly bad?
Nope, I used my old 15 watt on my fender 65 watt and it worked fantastic.
There really are no cables for specific watts of amps. However if you get into the higher watts, like 100W, you may want to consider a cable of better quality if you lost yours.
No they're the same. You'll be fine.
as long as it has the same specs your amp requieres. like if your amp requires 15v dc, at 300 micro amps(for example) and you use a cable with a significantly less or more then it would be bad. if the cable itslef is just a cable and doesnt alter the electric flow then it should be fine. trust me on this one i am studying to be an electrical engineer.