  Let $\mathbb{F}_{q}$ be a finite field of characteristic $p$, and let
$W_{2}(\mathbb{F}_{q})$ be the ring of Witt vectors of length two over
$\mathbb{F}_{q}$. We prove that for any reductive group scheme $\mathbb{G}$
over $\mathbb{Z}$ such that $p$ is very good for
$\mathbb{G}\times\mathbb{F}_{q}$, the groups
$\mathbb{G}(\mathbb{F}_{q}[t]/t^{2})$ and $\mathbb{G}(W_{2}(\mathbb{F}_{q}))$
have the same number of irreducible representations of dimension $d$, for each
$d$. Equivalently, there exists an isomorphism of group algebras
$\mathbb{C}[\mathbb{G}(\mathbb{F}_{q}[t]/t^{2})]\cong\mathbb{C}[\mathbb{G}(W_{2}(\mathbb{F}_{q}))]$.
