Duplicate contents are always hated by Google, Please do not SPAM, Otherwise Google god will BAN your site permanently.
Yes, it can affect your rank. Post unique articles only on the new website and leave the other website alone. Better be on the safe side than sorry.
If there is a redirection, then there is no reason for Google to check that this is a duplicated content!
In short, yes! it will affect on your website. Just purchase new articles, invest a little. If it is your money site, you don't want to lose it, man.