Yeah, that would be the same. I got that idea myself too. Try to record yourself playing a few notes in E minor or any key you like. Then record again, but this time, you play the note that's 5 notes up in the scale you're using. You'll recognize the sound. However, as you understand, it wouldn't be exactly the same, because on one guitar when you play a power chord you get that crunchy sound as there are several strings in motion. Because of this, the sound will be cleaner/clearer when you record it the way I explained.