Open banking is the narrower case: sharing bank-account data and payment initiation, typically under a specific regulatory mandate. Open finance is the broader case: the same data-sharing model extended across the full range of financial products – savings, investments, pensions, insurance – often through commercial agreements as well as regulation.
A wider product scope means a wider, less uniformly regulated chain of intermediaries and third-party providers. Open banking regimes typically define a narrower, more consistently regulated set of participants. Open finance pulls in a broader set of intermediaries and third-party providers, many of which sit outside any single regulator's perimeter depending on jurisdiction and activity type. The liability chain gets longer and less uniform at exactly the point where more institutions are relying on it.
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