Aceh is different. They were fighting for independence from 1975 onwards. When the Tsunami end of 2004 it aceh the strongest (pretty bad), both sides compromised, allowing aceh to be the only region of Indonesia under sharia law.
What about Kalimantan? I've been to Kota Kinabalu (many years ago) and the social difference compared to Kuala Lumpur was striking. I assumed Kalimantan was socially more similar to its island neighbors. Official laws and social norms do not always align.
Actually I do not know. Kalimantan is the Indonesian part of Borneo, while Kota Kinabalu is on the Malaysian part of Borneo. Generally Malaysia is more conservative than indonesia. Even in KL Muslims are banned from buying alcohol, while in Indonesia that's not generally the case.