The lanthanoide contraction is responsible for the fact that

Zr and Hf have about the same radius

Zr and Zn have the same oxidation state
(Atomic numbers: $\mathrm{Zr}=40,\mathrm{y}=39,\mathrm{Nb}=41,\mathrm{Hf}=72,\mathrm{Zn}=30)$

Zr and Y have about the same radius

Zr and Nb have similar oxidation state