No - 8-9mm is not close enough.
8.x mm you have mystery junk, 9.2-9.6 mm then maybe it is RN4081 but could also be Joye 306, less likely Joye 510 w/ cartomizer, possibly the opposite electrical polarity L88b which is Blu (you only need to worry about opposite electrical polarity if you use their charger on 510/306 batteries or their batteries in a 510/306 charger in which case you melt the battery. There is also one 510 clone that is opposite electrical polarity)
Anyway - if what you have is over 9mm then you need to try 2 threadings: 510 (more or less the same as 306 threads and L88b thread - LiquidXPress has some prefilled 510 cartos, Blu has prefilled L88b or 306 cartos) and RN4081/DSE103 (aka Njoy, Smokestik and AZSmokeFree has a small selection of prefilled, and could also be DSE103 but that uses the same cartos) - buy cartos for each of the 2 threadings and see which fits