Technically the throttle is the valve that regulates air entering the engine. When the valve is closed the engine is 'throttled'. The thing you use to control this (twistgrip on a bike, foot pedal in a car) is the 'throttle control'. When you open the throttle the engine (and vehicle if it's in gear) accelerates - and 'accelerator' is so much more fun to say than 'throttle control' :laugh
The other thing is that some engines don't actually have a throttle - a diesel engine for instance - so by default they can't have a throttle control, but they can have an accelerator.
And after all that I'd say you need 32 73 1457015 for an '85 but it may be worth measuring your old one if the opportunity exists to confirm the length.