While not necessarily related to having two configurations in the same photo, I've been having the thought recently that perhaps we will see two variants (not upgrades) of the J-36 be developed concurrently.
One optimised for strike, the other for air superiority.
A "JH-36" with trench exhausts and perhaps a rotary launcher in the main IWB to strike at 2IC. And a "J-36" with 2D-TVC netting improved maneuverability for BVR A2A engagements. With other smaller, less externally visible changes as well.
This would boil down to how cost-effective it is to create specialised variants (that leverage features that would require a refit, like different exhaust types) rather than just use the same platform with different expendables (e.g., munitions) for different missions.
Of course, the platform could just be so modular so they wouldn't even be divided into very "separate" variants altogether. But I'm not sold on modularity for top-end platforms just yet, especially not for significant changes like exhaust type or IWB internal mechanisms.