You can probably sell Spiderman for $50 at least and buy RDR2 on Kijiji for $70. So $20 out of pocket.
If you trade in spiderman for $50, you'll have to pay $30+taxes for RDR2. But it's way less hassle and you know you have recourse in case the game for some reason fails.
Or just keep Spiderman and get it off Kijiji for $65-70.
RFD Gamertags/PSN ID Community