Hello ASF,
Welcome to the Community page,
You can when you set up Quickbooks Online specify that the business type is a charity. It will then tailor the chart of accounts to those a charity would need and have donors as a header rather than customers. It is not a separate NFP product however.
With that product being out in the US it might come out into the UK. We have had no word about it but it might be something that comes in the future.