Scholars have debated the relationship and differences within astika philosophies and with nastika philosophies, starting with the writings of Indologists and Orientalists of the 18th and 19th centuries, which were themselves derived from limited availability of Indian literature and medieval doxographies. The various sibling traditions included in Hindu philosophies are diverse, and they are united by shared history and concepts, same textual resources, similar ontological and soteriological focus, and cosmology. While Buddhism and Jainism are considered distinct philosophies and religions, some heterodox traditions such as Carvaka are often considered as distinct schools within Hindu philosophy.
Try to answer this question if possible (otherwise reply "unanswerable"): What are Buddhism and Jainism regarded as in relation to religion and philosophy?
distinct