I went on the Geco website and found that, although they make loaded centerfire rifle ammunition, they don't seem to provide unprimed brass for rifle cartridges. They do, however, provide unprimed brass for a number of handgun cartridges. I don't know whether the Geco centerfire rifle ammunition is identical to the corresponding RWS ammo, but I suspect it isn't. Both RWS and Geco, along with Rottweil (which is really just RWS; they seem to be the same company) and Norma, are parts of the larger Swiss RUAG corporation, but that doesn't mean that corresponding products from the companies are identical.
RWS brass has a reputation for hardness and toughness and generally excellent construction. Norma brass, although decently made, has had a reputation for being soft. Whether this is still the case, I don't know. I'm shooting Norma brass in my 6mm. and .22 PPC rifles, and so far it has held up well.