Both questions are written by the test writers - - and it doesn't matter if the questions are objectively harder or not - - what is important is how you're feeling about the CAT like test vs. the paper based questions.

Perhaps you need to revamp your feelings about not knowing what comes next, and not having the (potential) freedom to move between questions, and only see one question at a time.

Yes, it's important that you familiarize yourself with as many online CAT questions as possible (we work with about a 5000 online question bank) and understand the 360-degrees of each question type that might appear.

Do your best to identify your weaknesses.
And initiate a plan to make sure you're relaxed and focused.

and know you've got the choice to perform the best you possibibly can.

good luck