Is this buffer possible? Question
Can a buffer solution be obtained by mixing-
A) $\ce{NH4Cl}$ + $\ce{CH3COONa}$
B) $\ce{CH3COOH}$ + $\ce{NH4OH}$
My Thoughts
I know that a buffer solution can be obtained if we mix a acid and its salt of conjugate base or a base and its salt of conjugate acid.
But I was wondering whether a buffer solution can be prepared if we mix a weak acid and weak base or if we mix an acidic salt and basic salt?
Both cases are equivalent in the case of    molar ratio 1:1. It would lead to a double buffer of $\ce{HAc/Ac-}$ and $\ce{NH4+/NH3}$. But the buffer capacity would be inferior, as the resulting $\mathrm{pH}$ is too far from the both respective $\mathrm{p}K_\mathrm{a}$.