Yes. I have two Case Small Texas Jacks in Amber Bone CV, two Case Medium Jacks in Sunset Winterbottom Bone SS, and at one point I owned two Case Peanuts in Chestnut Bone CV.
Here are the reasons:
Medium Jack in Sunset Winterbottom: I had ordered one from a dealer and it still hadn't shipped in over a week, and they were showing out of stock on their web page (though was in stock when I ordered). I had experienced a couple of times where dealer web sites didn't match inventory, so I ordered from a second dealer. When I contacted the first dealer, they actually shipped it so I ended up with two. Rather than returning one, I used one for a dye-job experiment so I could keep the other like new. [Incidentally the dyed knife looks MUCH better than the factory coloration on that knife.]
Amber Bone Medium Jack CV: I wanted to experiment with allowing / coaxing a patina on the CV steel, so I bought one for patina formation and one to keep shiny.
Peanut CV - Same deal, wanted one to experiment with and the other to keep original. I ended up gifting one of them to a forum member on another site, new and unused in the box, and never did the patina experimentation, having satisfied my patina curiosity with other CV knives.
Now I do have multiples of some patterns but in different steels and/or handle materials, so not identical. I'm guessing for the purposes of your question that doesn't count. (like having 3 Case '18 pattern Medium Stockman knives - one in Amber Bone CV, one in Pocket Worn Orange SS, and one in Stag SS).