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CatalunyaCaixa is a successor entity (not a synonym) of Caixa Catalunya resulting from a merger.
Caixa Catalunya (also, Caixa de Catalunya) was a Catalonian savings bank (ca, es) which merged in 2010 with Caixa Tarragona and Caixa Manresa to create the new entity, CatalunyaCaixa (ca, es). (This was later nationalized and purchased by BBVA.)