Sncf train ticket exchange?

Question

I booked a train ticket through the sncf site for lille to paris return later on this week. I just found out that a friend will be in paris on tuesday so I was wondering if I could exchange them for tickets on tuesday. My tickets are "echangeable et remboursable" but the prices for tickets on tuesday are more expensive than what I had paid when I booked my own tickets several weeks ago. What I'm wondering is, if I exchange these tickets for tickets on tuesday, if i will have to pay anything extra due to the price difference. thank you all so much!

Answer 1

you're absolutly right : you'll have to pay the price difference. and if you had found a better price, they would have given your money back.