GZB, Dirt drop, randonneur and flayed (flared?) are essentially the same. The drops are outward of the tops at some cost of width along the tops, Google likely has tons of images. Trekking bars are complex in the number and style of the bends and aren't drop bars at all. If you're happy with the bars on the Roubaix then a safe suggestion is to get another set. The rando bars are good if your arm interferes with the upper bend of the drop bar.

Brad