In case of a cross organization API call, I can fetch all the organizations the current user has access to and get their associated ZedTokens (1 per Org) but I'll have multiple ZedToken and no idea of which one is the latest one to be used for a RessourceLookup on SpiceDB. Is there a way to compare the freshness of two ZedTokens to select the fresher one to make the reads calls (checkPermission, ressourceLookup)?