There are some studies which do show differences in neural activation across people who describe subjective differences in visualization.

2023: https://www.biorxiv.org/content/10.1101/2023.06.14.544909v4 2021: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8186241/ 2017: https://www.sciencedirect.com/science/article/pii/S001094521...