Use alternative page for product page?

I have a site that has some pages for products that rank well in the SERPS. I would like to start selling them online. But… I don’t want to create another page/post that will cannibalise ranking from the original page. Is there any way of telling WooCommerce to use an existing page for a product page rather than creating a new one…? If not I suppose I could move content to the WooCommerce product page and 301 the other, but I’d rather have it the other way around if possible. There’s only a couple of products to do it to so not too hard I guess…

http://www.penair.com.au/air-purifying/daikin-air-purifier.html
http://www.penair.com.au/air-conditioning/daikin-online-controller.html

http://wordpress.org/extend/plugins/woocommerce/