Frankly speaking, I didn’t see that much of a difference. Golden Rose formula is thicker than OPI, but application is quite easy as well. OPI is a little bit shinier, but difference is barely noticeable. The only major difference is that DS Design is much more durable (4-5 days) than Golden Rose (2-3 days), but that what you would normally expect from OPI nail polishes and huge difference in price.
In terms of color, Iced Latte is closer to cold color palette and OPI Design has obvious nude/brown undertones. In the natural daylight the difference in color is slightly noticeable, but in artificial light (lamps) you can actually see that these two are not the same.