You can exchange passes but there is a 15€ fee and I’m not sure they would let you buy a cheaper pass…
Reservations are tied to a person and not a pass number so that doesn’t matter.
Hi @frankm_nl
You can exchange your original Pass if the conditions allow it. Please keep in mind that if you buy a Black Friday promotion Pass, this needs to be activated on the 1st of June latest, thus the standard activate up to 11 months after purchase does not apply.
If you have any question, please send us a request here: https://eurail.zendesk.com/hc/en-001/requests/new
As @thibcabe indicates, reservations are tied to the name of the passenger and not the Pass number.