Good day and welcome to Trainz Classics.
There is a short answer and a long answer to your question.
Short answer - Yes!
Long Answer - When first installed you will likely find many missing dependencies. Some of these will have to be downloaded some might be able to be imported from 2006. TC was designed with limited built-in content and therefore, some work is always involved in installing assets unless they are specifically designed for TC!
There are numerous threads on how to transfer content to TC so I will not indulge in a full explanation here. Please use the search facility to locate the transfer threads.
Have fun!
Brian