My question has an easily formulated generalization, which I will state first. Let $\sigma \subseteq \mathbf{R}^n$ be a full-dimensional strongly convex polyhedral cone. For each lattice point $m \in \sigma^o \cap \mathbf{Z}^n$, minimally generating inside the interior cone $\sigma^o$, let $S(m) \subseteq \sigma^{\vee} \cap \mathbf{Z}^n$ denote the set of lattice points $u$ with $\langle u,m \rangle = 1$. The generalized question is:

**Does $S(m) = S(m') \not = \varnothing$ imply that $m = m'$?**

**UPDATE**: As Minseon Shin pointed out, there was a $2$-dimensional counter-example to the previous formulation of the above.

For my main question, as a special case of the above, assume that $\sigma$ is the nef cone of a smooth projective toric variety $X_{\Sigma}$. Then my question amounts to the following:

Let $D_1$ and $D_2$ be two ample divisors, minimally generating inside the ample cone. Suppose that there exists two effective curves $C_1,C_2$ such that $D_1 \cdot C_1 = D_2 \cdot C_2 = 1$. Then does $D_1 \cdot C = 1 \Leftrightarrow D_2 \cdot C = 1$ for all effective curves $C$ imply that $D_1 = D_2$?