I've started Cyteen by CJ Cherryh - I'm the type of person that reads dozens of books at once but everything's else gone on hold for Cyteen.

Amazing so far but can't shake the feeling that I've read the plot in the beginning before. I think Cyteen is too long / complex for me to have read it as a teen and forgotten about it, but I have read the Alliance/Union series in pub order up to it. Is there another book in the series with clones that includes a dinner followed by + a river boat journey?