EPR vs A1000 have different perfmance indicators. I’m not a nuclear engineer so I’m not fully sure on the differences but theres here’s a paper outlining some

EPR construction has been pretty painful in Finland and was over budget and over time. It’s probably also a bit of a political move to curry favour with the Americans by procuring it from a Westinghouse. Also there no harm in having knowledge for different types on nuclear reactors on the European continent. The French design is still a beast and once Flamanville and OK3 go fully live more countries will have confidence in the French design. There’s just been a lot of teething problems with it. To be fair Westinghouse have lost a lot of their production/manufacturing knowledge most of its in Korea. The Americans are trying to repatriate the knowledge but it will take a long time to reintegrate the supply chains