Tickets from French railway to Spain?

Renfe would not take my credit card info after multiple tries for a trip from Barcelona to France, so I looked at the tickets through the French Railway (SNCF) and looks like they are actually a bit cheaper. My question is, should there be any problem using tickets from SNCF at the station in Barcelona, as opposed to Renfe issued tickets?

Posted by H J
LaGrange, Ga, USA
1172 posts

Check out the site the man in seat 61...great source for railroad information of all types.