There are several choke profiles shown here
https://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=630097

Also referred to as a "Bell choke"
https://sageandbraker.com/blogs/news/shotgun-chokes

Some call the set up when the R barrel choke is tighter than the L as "reverse chokes". Often for incoming driven game or waterfowl, but John Olin thought it was the best choice for the outgoing targets on the skeet field.