They are drop bars. I don't like the look of the quill converters to be honest.
I would have thought you could get away with putting 26mm bars into a 25.4 stem but I wouldn't try it the other way around, 25.4 bars into a 26mm stem. I could put up with a couple of scratches here or there, as long as they are tight
I might buy some cheapish digital calipers and measure the bar to be certain. They'll never come in wrong I suppose.
Cheers