Well, I guess you could do it if you want. Everyone's perspective isn't same. But, there are some members as well who are not on Bitcointalk and you might see some different point of view. If you want to discuss something that is already discussed before on the other forum, there is nothing wrong. But, I expect you to create valuable topics with new title and the content as well. The subject could be same. There is nothing wrong even if you just copy-paste your threads with giving a link that it's your original content, yet, it would be better if you create new OP.