If space is available, the entire Starlight trip will be repriced at current bucket. Depending on what bucket you originally booked in, current bucket could be a steep increase in the fare.
Sacramento is the only valid, guaranteed, connection point between 5 and 14. What you propose makes me think you made two, separate reservations, one RNO-SAC, the other SAC-whereever. It is never a good idea to put a same day connection on separate reservation numbers. You lose the protection of the guarantee (hotel room, rebooking), if missed. You will also just be considered a no-show on the outbound train, forfeiting your fare and canceling any other segments on that reservation. If your trip is on one reservation, Amtrak will not change your connection from SAC, since it is the only valid connection point.
If you have two reservations and are okay with keeping the SAC connection, call Amtrak and see what they can do. They probably cannot reissue as one reservation without triggering a reprice, but it doesn't hurt to ask. In any case, they will be able to put a manual note in the reservations. That won't get you on the automatically generated mis-connection list and so be provided with a hotel room billed to Amtrak and rebooking automatically.
But it does give you documentation with Amtrak that you can ask for, and probably receive those benefits, especially rebooking. For hotel, you may be in reimbursement situation rather than an Amtrak direct bill, though.
If you have separate reservations and still want to connect at EMY, bear in mind that Amtrak will not take any responsibility for a missed connection. You will be entirely on your own and out whatever fare you paid for the Starlight.
For the future, do not book any more same day connections on separate reservations. It is just inviting trouble.