In principle, the VOC was supposed to have its coins struck in the provincial mints of the Republic. In practice, the VOC acquired minting rights locally. The locally struck coins are struck with local means and technology. That means that whereas a VOC duit struck in the Republic would be thin, a copper coin struck in South India or what is now Sri Lanka would be thick and heavy. Similarly, silver VOC coins struck in the Republic would have the specifications of other silver coins struck there, while locally struck silver would be struck according to local specifications, e.g. silver fanams, rupees or fishhook money. The only VOC inventions I can think of are the "bonk" types, including the 4-3/4 stuiver bonk. However, these are emergency coins.
Peter