The cool thing about a core transducer "platform" (7mm XWB) is that you can apply countless other acoustic principles to the transducer itself, and the surrounding environment/housing (damping, membrane materials, placement/distance to name just a few) to it in order to achieve wildly different tunings, rest/response times, extensions and so on. Of course there's some family resemblance in the flesh and also in sound so yes, there's shared DNA, but think of each earphone/headphone model as its own unique person. IE 300's own tuning is one thing, and MMCX puts a huge multiplier in play when thinking of the combinations of SE source, amp, cable, driver, and then the balanced versions of that. That's where the fun really begins in hifi.