Nope they arent
i do have some tutorials on my site:
First check "Complete guide to character compiling JK2 / JK3 guide" to understand the process.
To help understand how to weight the character, i highly recommend watching Paul Greveson's workflow (JK2/JK3 differs a bit but the technique remains the same):
As for exporting stuff out from other egines, you'll have to dig around the web and find out.