The correct answer to this open question is the following.
The ideas of Descartes and Bacon were similar in the following way.
Both philosophers started to comment and critique the philosophical approach of ancient Greeks. Rene Descartes used a systematic and rational approach, and Francis Bacon used and empirical and practical approach. Both philosophers considered that the concepts of nature could be analyzed dividing them into smaller parts to better comprehend them.
Their ideas were different from previous systems of thought in that they used reason, logic, and an empirical approach to explain their concepts so people could have a better grasp of their ideas.