arXiv:2611.09011v1 Announce Type: new Abstract: We develop an abstract variational framework for convergence rates of parametrized problems and their Galerkin approximations, with applications to nonlocal diffusion. The main objective is to quantify modeling and discretization errors in terms of the nonlocal horizon, the mesh size, the Sobolev regularity of the local solution, and the compatibility of boundary data. We establish error estimates in energy and $L^2$ norms and develop an adaptation of the Aubin--Nitsche argument that uses regularity of the limiting local dual problem. This approach yields improved $L^2$ estimates without requiring additional regularity of the nonlocal dual solutions, including for integrable kernels. We apply the framework to two constant-horizon nonlocal Laplacians with exterior boundary data and to heterogeneous localization models with classical Dirichlet, Neumann, and Robin conditions. The resulting estimates provide quantitative guarantees of asymptotic compatibility and improve existing error bounds under weaker regularity assumptions. Numerical experiments illustrate the convergence rates and examine the sharpness of the estimates.