Different chemical compounds possess distinct acid dissociation constants, making it a matter of basic chemical knowledge that the benzylammonium ion and phenol have different relative acidic strengths.
The claim compares the acidity constants (pKa values) of two distinct chemical species: the benzylammonium ion ($C_6H_5CH_2NH_3^+$, with a pKa around 9.35) and phenol ($C_6H_5OH$, with a pKa around 9.95). Because different chemical substances inherently have different structures and functional groups, their acidic strengths (proton-donating tendencies) are fundamentally different by definition and basic chemical observation. This is a matter of common knowledge, requiring no specific retrieved citation to verify.