In what ways are the Advaita concept of 'Nirguna Brahman' and the Buddhist concept of Buddha Nature similar and different?

In what ways are the Advaita concept of 'Nirguna Brahman' similar, and/or different, to the Buddhist concept of Buddha Nature? This is a good comparison, that is where the doubt arose: [Nonduality in Buddhism and Advaita Vedanta](https://studybuddhism.com/en/advanced-studies/abhidharma-tenet-systems/non-buddhist-asian-traditions/nonduality-in-buddhism-and-advaita-vedanta) Maybe there is a similarity...?