Considering this project. The scope would be comparing the Theatrical and Extended Edition edits, while also comparing the enhanced effects and fixes done for the 2020 UHD release to the original composites.
2010 Theatrical Edition Blu-rays
2011 Extended Edition Blu-rays
2021 Theatrical Edition Blu-rays* (have UHD)
2021 Extended Edition Blu-rays* (have UHD)
*need to purchase