I am recalling some posts that discussed problems when a rail ticket (purchased online) did not match their physical credit card at the time of travel. I have been using "ShopSafe" -- a BofA feature that creates a pseudo card to make limited, specific online purchases.
The tickets have been purchased and the charges made to my cc account so the purchase is fine. However, since the ShopSafe details (card, expiry date, code, and limit) are a mask over my real, plastic card, the printed rail ticket details will not match my physical, plastic card.
Will this pose a problem on either SNCF or Renfe? I can take a printout of the 'card' used for the purchase. It looks like a credit card but is, of course, a paper version.