No I don't think so. Those that apply for centurion the same time as EIB are the ones that built their kit *for* centurion, but as it is today, you *must* have EIB before centurion, so as a result of that, you apply for centurion as soon as you have EIB approval. I don't think we'll see so many upgrade from EIB to centurion as we'll see people build for centurion intentionally.
Those that already had centurion ready armour before it even existed had that because they went above and beyond EIB and today have centurion, or they don't bother to apply. I may be the first awarded centurion, but not the first one with an armour worthy the title. But it was some really small changes I had to do, and nothing big because I built my kit with all the EIB "should have". Which is kind of what centurion really is, but instead of "should have" those things are "must have".