According to the two-country general equilibrium (PPF/indifference curves) model, if both countries production possibilities frontiers are identical, then:

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If both countries' production possibilities frontiers are identical, then they must have the identical resource endowments and technology. This is because the production possibilities frontier is determined by the resources and technology available to a country. If two countries have the same production possibilities frontier, then they must have the same resources and technology.Additionally, if two countries have the same production possibilities frontier, then they could still have different comparative advantages if their tastes differ. This is because comparative advantage is determined by the relative costs of producing different goods in each country. If two countries have different tastes, then they will have different relative costs of producing different goods, and thus they will have different comparative advantages.Finally, if two countries have the same production possibilities frontier and different tastes, then they could find that international trade is not welfare-increasing. This is because international trade can only be welfare-increasing if it allows countries to consume more of the goods that they value more highly. If two countries have the same production possibilities frontier and different tastes, then they will not be able to consume more of the goods that they value more highly through international trade.

According to the Two-Country General Equilibrium (PPF/indifference Curves) Model, If