Understand that an abundance of power capacity does not 'force' power into a load, just like a powerful amplifier doesn't automatically overload a speaker (unless you have no restraint). In the second example, the ability is there because amplifiers have an adjustable output voltage, aka the volume control.

Either cord could have been original equipment. You'd have to ask the maker or a dealer if you really wanted to know, but rest assured that computer buffs don't sweat the same thing when it comes to computer power cords.