I did a site for a client of mine let's say it's abcbaseball.net. A couple of months later, she bought a competitor's domain name, let's say abcbaseballshop.com. Unbeknown to me, while the transfer of ownership was taking place, she asked the old owner to put up duplicate copy of her site of the domain she'd just bought.

I've advised her that she's going to get dinged in the SE's (she didn't know that) so now she is asking: is it enough to change just the main page on one of the sites so it's got new and different content, or does she really have to change the content on all of the pages on the new domain?

I'm guessing that the SE's aren't stupid and will evenutally figure out that the subsequent pages are the same, and then, she'll get dinged!

Thanks
Michael