Hmm, actually you may be abit mixed up with the usage of contrasting & comparing.
Contrasting involvlves both finding only differences, comparing involves both differences & similarities. However, this terminology is often used in questions, though using them as your techniques in essays are alright, just so long as you state, the effect of this technique. i.e. Through the sharp contrasting views of their journeys brought upon by Skrzynecki & Lee, an effective and new understanding of this and that arises....etc,etc.
Though simile itself is a technique, there isn't much of a need to state the use of 2 techniques in a single quote/paragraph in an essay.