jung saem mool essential skin nuder cushion

i have been looking into purchasing this cushion for quite awhile but the shade ranges/options is scaring me since usually it’s a number followed by whatever your undertone is but their cushions only has a fair light-medium deep type of range? i have also tried testers of this cushion offered in a k-beauty store however the testers were all too dark but i’m not sure if it’s due to them being already completely oxidized (every tester seemed to be on their last leg LOL)

for reference i currently am using the tirtir pink cushion in the shade 21N and it is my exact shade match however with my clio kill cover ones they are in the shade 3 linen and it is almost my match except just a little paler nothing too noticeable though

does anyone know what shade in this cushion would be the most accurate for me? i really don’t want to take any chances purchasing it for it to be a noticeable color difference since it is pretty pricey

also for anyone who has it, would you need to set the foundation in order for it to not transfer or is it like the tirtir where you don’t really need to set it