This is a possible way of structuring your thesis statement. Make sure that it is easy for the reader to recognise what devices you will be using to analyse the two texts.
In (Name of Work) and (Name of Work), both (Full Name of First Author) and (Full Name of Second Author) (use, employ, utilize, rely on) (device/strategy/technique x 3) to (show, reveal, emphasize, argue, insist, point out) that (effect/purpose/answer to question).