Hi !
as far as I know there is NO standard on that
Juniper calls it route preference and not the absolute number is important but the relative position to the preference of competing routing protocols
in principle the sequence is quite similar between ciscdo and juniper ( NOT the abosulte value)
the only main and important difference is EBGP ,on cisco it is considered better than any dynamic IGP, on juniper both IBGP and EBGP are considered less preferent than any IGP
regards
Alexander