Exact same knife (same pattern, steel, handle materials, handle colors): three knives, 2 of each. One was a mistake. Ordered the knife from one dealer, thought it was out of stock after I placed the order and before I verified that, ordered from a different dealer, but both showed up. I decided to keep them both so I could modify one and leave the other one intact.
The other two were because I spotted a great bargain price on the duplicates, and wanted to experiment with patinas on them while leaving one intact.
Now as far as having more than one of a same knife but in different handles or steels, then yes, guilty as charged there. Case slipjoints. I think the max I have of one pattern is 5, but each is unique as to blade shapes, steels, handles, or some combination of those.