Check if:
      - we find a cron with same cmd, old state behavior
      - but also be smart enough to remove states changed crons where we do
        not removed priorly by a cron.absent by matching on the provided
        identifier.
        We assure retrocompatibility by only checking on identifier if
        and only if an identifier was set on the serialized crontab

def _cron_matched(cron, cmd, identifier=None):
    '''Check if:
      - we find a cron with same cmd, old state behavior
      - but also be smart enough to remove states changed crons where we do
        not removed priorly by a cron.absent by matching on the provided
        identifier.
        We assure retrocompatibility by only checking on identifier if
        and only if an identifier was set on the serialized crontab
    '''
    ret, id_matched = False, None
    cid = _cron_id(cron)
    if cid:
        if not identifier:
            identifier = SALT_CRON_NO_IDENTIFIER
        eidentifier = _ensure_string(identifier)
        # old style second round
        # after saving crontab, we must check that if
        # we have not the same command, but the default id
        # to not set that as a match
        if (
            cron.get('cmd', None) != cmd
            and cid == SALT_CRON_NO_IDENTIFIER
            and eidentifier == SALT_CRON_NO_IDENTIFIER
        ):
            id_matched = False
        else:
            # on saving, be sure not to overwrite a cron
            # with specific identifier but also track
            # crons where command is the same
            # but with the default if that we gonna overwrite
            if (
                cron.get('cmd', None) == cmd
                and cid == SALT_CRON_NO_IDENTIFIER
                and identifier
            ):
                cid = eidentifier
            id_matched = eidentifier == cid
    if (
        ((id_matched is None) and cmd == cron.get('cmd', None))
        or id_matched
    ):
        ret = True
    return ret