To analyse convergence and divergence in Natural Resource New Governance Arrangements (NRNGAs) two regimes in the environmentally-related areas of forest and fisheries management are examined. The findings reveal limited convergence across sectors and countries in the general aims and ideas behind NGAs and evidence of significant policy divergence in the tools and mechanisms created for their implementation. The reasons for the differences lie primarily in the policy formulation process. While the impetus for the adoption of both NRNGAs is in the international and regional realms, without the force of either international law or competitive advantage, pressure for convergence is weak. Aspects of the policy formulation process, especially the manner in which the changing capacities of domestic public and private actors active in the affected resource policy arena interact to influence policy design, are critical for explaining policy convergence and divergence. Specifically, the interplay between the effect of the internationalization of resource policy issues, tending to increase private capacities at the expense of the public one, and the declining importance of primary industries, which has the reverse effect, is shown to have played an important role in NRNGA policy dynamics.