Ahh – so it’s possible this isn’t reuse of the same code, and is instead just a rewording. I’m afraid I don’t have the domain expertise to know! But perhaps someone else can say.
So previously, the title and description was:
15114: Tax policy and tax administration support
Support to the ministries of finance, revenue authorities or other local, regional or national public bodies on tax policy, analysis and administration (including “non-tax” public revenue).
15114: Domestic Revenue Mobilisation
Support to domestic revenue mobilisation/tax policy, analysis and administration as well as non-tax public revenue, which includes work with ministries of finance, line ministries, revenue authorities or other local, regional or national public bodies. (Use code 16010 for social security and other social protection.)