As far as I know they are are the same. But just know, cog/lockring is one place you really don't want to cheap out on. I hear good enough things about 1/8th" stuff and they are doing a thing where if you like them on facebook you get a coupon. So I would do that if I were you, just make sure you are getting a cog in a reasonable size appropriate for how you will be riding. Look up stuff about gear inches to figure that out. Most people are fine somewhere between 70-76 gear inches. Much more than that and it starts being a pretty tough but doable gear.