tangor - 9:45 pm on Jan 4, 2012 (gmt 0)
How many words are we talking about? This goes to the "content" of each page. Secondarily, since this is ecommerce, not strictly informational, where do you want your visitor to land? Third, I have no doubt that a rewrite which embraces both pages will result in a tighter presentation.
Back to the OP query... Keywords in title hurt? Commonsense says no. Two pages with same keywords (and intent) can be confusion for the SE, not the visitor.
I'd lump 'em together (and remember that 301 for the page which gets merged to the final).