-f suffix definitely has no igpu, so avoid if not buying dgpu.
for ryzen 5000 series and earlier (am4), only those with -g suffix (eg 5500gt, 5700g) have igpu. these are what i refer to as am4 g series.
for ryzen 7000 series and later (am5), simply avoid those with -f suffix (for now 7400f, 7500f, 8400f, 8700f), everything else have igpu.
which tier and gen of ryzen depends on ur performance target and budget.
b550 boards are generally not bottom of the barrel products like a520 ones, so u usually get a better product overall. then again, am4 g series cannot take advantage of pcie gen4 offered by b550, so in some sense a520 is more well suited.
the fusion series are not just clones, they are straight rebadges of the sama im series

no different from most tecware cases.
thats what i said:
dont think theres such a thing as a 7600f anyway.
as a dedicated gpu and paying dgpu money for it sure, but having that level of performance as integrated isnt too bad and can make for some interesting tiny builds, especially compared to what was previously available.