can i add my times from retroachievements leaderboards to these ones?

If your VODs are submitted through the proper channels and reviewed then we can find out.

i don't have video, just the times from the hardcore leaderboards there

VODs that can be verified and follow the rules of the leaderboard can be submitted. They are then reviewed and either denied or accepted from there. If you do decide to submit videos be sure they adhere to the stated rules of the leaderboard. I do appreciate your interest and hope to see your runs in the future.