Electric and acoustic guitars are really two very different instruments; a bit like comparing trombones with trumpets. The way you hold and play the basic notes is fairly similar, but the techniques are very different for electric because of the amplification and distortion, and of course the sound is extremely different.
I'd agree with this distinction between classical (nylon stringed acoustic) and electric guitar, but steel stringed acoustic plays very similar to electric. I agree that people tend to play different things on them but if you're playing both with a pick you're doing the same techniques on both.