simplest way is to
use the lower version of exp to do the export
and 
the same lower version of imp to do import.

1. create tnsentries in host1 ( where 8i is installed) to connect to host2 (where 9i is installed,let it be 9idb)
2. create tnsentries in host1 to connect to the local   8i database (let it be 8idb)	

-- the dump file is created locally in host1
[b]
exp userid=8i/8i@8idb file=weeklyLdat.dmp log=weeklyLdatExp.log tables=(8i.COMPANY,8i.COMNUMBR) rows=y[/b]
-- use the dumpfile in host1 using imp tool in host1
[b]imp userid=9i/9i@9idb file=weeklyLdat.dmp fromuser=8i touser=9i tables=(9i.COMPANY,9i.COMNUMBR)  log=weeklyLdatImp.log rows=y
[/b]
-- NOTE: before importing into 9idb you may need to truncate the data.else data will get appended.
-- use     sqlplus -s 9i/9i@9idb @truncate.sql
-- where truncate.sql 	contains
--	   truncate table table1;
--         truncate table table2;
--         exit; -- else sqlplus session will not exit.
-- and you must specify ignore=y in your imp
-- so the new script would be
[b]

exp userid=8i/8i@8idb file=weeklyLdat.dmp log=weeklyLdatExp.log tables=(8i.COMPANY,8i.COMNUMBR) rows=y
sqlplus -s 9i/9i@9idb @truncate.sql
imp userid=9i/9i@9idb file=weeklyLdat.dmp fromuser=8i touser=9i tables=(9i.COMPANY,9i.COMNUMBR) ignore=y
[/b]