Those are two different thing, 022 FAC are more in line with the traditional Soviet missile-boat doctrine - no info if PLAN have made modifications to that doctrine, with the likes of integrating over-the-horizon target illuminating capabilities from other platforms and the necessary datalink; if the necessary datalink have been established, they could've let the 022 as dedicated attack pack with C4ISR facility on land / airborne platform, 056 not necessary in this.
What are two different things?
It's been widely established that 022s are meant to be operated in conjunction with off board, OTH targeting (already are) and likely within a larger part of china's C4ISR system for the westpac in future, operating nearer to china's coast and SCS. I'm not sure what the soviet missile boat doctrine was but 022s are certainly meant to fire missiles OTH with extensive datalinking. Tphuang's posted quite a few articles detailing exercises in which this is carried out on the forum and his blog over the years.
056's probably won't be able to keep up or provide augmentation to guidance for 022's missiles -- that role will be taken by GX aircraft and other sources. But they can act as a command ship (don't be fooled by the word "command" as if it's something unique to 056. 054/A, DDGs upward from the refitted 052 can act as a "command" ship in the same way)
Whereas 056 thus far lean on the contemporary multi-role corvette that just about every other navy that'd field corvettes as part of their surface combatants.
Should 056 is, as said by many, primary to replace the 037 series submarine chasers still in service, that'd be a major qualitative improvement, though in terms of support facilities and personnel requirements also requires a significant investment as well.
Imo replace the old sub chasers, and some roles which current smaller frigates and patrol craft take too. These are almost certainly going to be built en masse and act as a near seas patrol, ASW, lightweight surface strike asset.
