1st..2nd.. right, I mean the one he mentions as "from Turkey".
. The handles are different ,correct. But I am 100 % sure both his one and the one I show are from the same Black sea region and same mentality. Check the fullers and proportions. I have seen both type handled and bladed samples. Just my assumption , is that flat, yataghan like handles can be older than the round ones,perhaps 19th c.,and then in 20th c., classical etnoghraphic weaponry decoration styles started to leave their place to easier types . The small one in my picture is more a tool, to cut something etc. , it could work good for something in that region where is dense woodland . As you say, his sample looks a bit more violent , perhaps closer to what I told about the early 20th c. usage of these knives. I attach 2 more samples, round and flat handled, both from the same region.
regards