Barcelona > Lyon on 9/3/2013 using 2nd class Railpass

Can we use a second class railpass for first class seat reservations? If so, what is surcharge Is it full price of ticket? We are unable to book reservations with our 2nd class railpass for Barcelona to Lyon on 9/3 (The Narbonne to Lyon leg seems only available for 1st class). We want to avoid having to pay for full ticket price from Narbonne to Lyon leg (want to use railpass day).
1 person has
this question