That's what the J-20A/S and J-35A are for.
That aside, ultimately I'd wager that aesthetic doom and gloom or overarching theory crafting with regards to the nozzles and arguably even the intakes of the aircraft are premature until a third distinct prototype surfaces. Because if one looks like that and the other like this, it can simply come down to validating different components under real world flight conditions (an important step despite the advancements in modern simulation tools). An additional prototype could lean more into one way or the other, which may give us the general direction where things are heading. Because at two prototypes, I'd argue all bets are still off aside from certain fundamental characteristics (three engines, two seats, cranked delta).
Now if a third prototype would look different from the first AND second one, that's where it would drift off into the realm of borderline trolling.