https://wccftech.com/corsair-adds-the-vengeance-rgb-pro-sl-to-the-vengeance-rgb-pro-lineup-with-a-slimmer-44mm-design/

The original VENGEANCE RGB PRO design was well-received, available in both a white and a black color scheme, but Corsair saw an area where an improvement could be made. The VENGEANCE RGB PRO lineup is a lineup that combines functionality and design with a sleek and elegant look. The latest addition to the lineup is the VENGEANCE RGB PRO SL featuring a slimmer design compared to its older counterpart.

The key difference to its counterpart is the new height 44 mm down from 55 mm. This height cut was due to compatibility issues with larger air coolers. The new module also comes with some slight differences in the design. The module features up to 10 individually addressable RGB LEDs and an anodized aluminum heat spreader seen on its larger counterpart. The difference is in the perforations below the RGB lighting zone with a greater amount of perforations that are smaller. It still retains the option of a black or white color scheme.