A common question is: “What is the difference between Daoism and Taoism.”
The fast answer is: the difference is only the spelling.
Daoism and Taoism are the same. It’s a translation issue of Chinese to English or the Pinyin factor. In short, for a few years, the West translated Chinese “D” to “T”. The Chinese government then switched more recently back to “D”.
From the surface level, we are only looking at two different English spellings meaning the same thing.