Yep, prove you can match the last guy, show that you have showed them due respect and spent the time learning the material as it is and, only then, go and show how much more wonderful you are. Whenever I have auditioned anyone, the #1 peeve is someone who has made a half-assed effort to learn the songs and thinks they can wing it. Prove you can nail it as they presented it to you and you'll go a long way towards getting the gig. You'll have lots of time to express yourself afterwards.