causal efficiency
emphasizes the aspect of 'change'
2nd of the 6 universal qualities (samanya guna), which emphasizes the dynamic nature of the six substances.
According to the Jains, change is integral in a substance and the stimulus of change is seated in the very nature of substance. This is vastutva or causal efficiency. As regards the question, whether causal efficiency is different from or identical with substance, the answer is - it is different, and at the same, identical.