Gold Ducats Of Chios And Venish - How To Recognise Them

The circulation of the Venetian gold ducats was not able to satisfy the market at the 15 century. As a result of that many rulers produce their own coins very similar to the Venetian one. A very good example is the gold Ducat of the Greek island Chios.

This topic has to do with the difference between those two coins and how the eye of collector will be able to recognise them. Which one is the Venetian one and which is the Chios one?

Are there any clear signs which can actually help us to tell the difference?

Here is a gold ducat of Chios: