Just remember this, you could play through Randy's exact set up, but you're still going to sound like you, and vise versa. A lot of your tone comes from your hands... how you hold your pick, how you pick the strings, how you mute the strings, etc...

One more thing, it's almost pointless to try to copy a tone you hear on a studio recorded album. There is so much studio "magic" going on, that it's almost impossible to get those tones. Grant it, you can get close, but probably not as close as you'd like.