I saw this website today. It is related to what I mentioned in the comment to the question:
Recently I saw a piece of news of a book being published later this year with a background of Mainland China and Taiwan cooperation, which can be used as a dictionary. – coolcfan yesterday
And now you don't need to wait to buy the book. The link above is the official site of the cooperation project and it provides an online version of the dictionary.
For example, when you search for 垃圾 on that site, it will give you the following result:
How to use this website:
For example, when you search for 印表机, you will see and “见【打印机】” in the
释义 section. This means: 1. 印表机 is a Taiwan word; 2. 打印机 is a word with the same meaning.
And then when you click on the link on “见【打印机】”, you will see on the page, which means this is a Mainland word. In the
释义 section you will see:
So you will know that for printer, 打印机 is the Mainland word, and 印表机 or 列印机 is the Taiwan version.