I’m working on a task that has this format as well. I made two separate pages in the block: one where the Field 1 image is on the left and a second where the Field 1 image is on the right. Then I used display logic to display one or the other for each participant. I think there are a few ways to do the randomization and display logic, but I created an “embedded data” field in Survey Flow with ${rand://int/1:2} (which randomly assigns each person to 1 or 2) and then used display logic “if embedded data field = 1, display question” for each question on the first page, and “if embedded data field = 2, display question” for each question on the second page. Sorry this way is a bit messy, but I couldn’t think of any simpler way.
