Yes, you can do that, eg
C:\temp>cat multi_owner.par
owner=scott
owner=hr
C:\temp>exp parfile=multi_owner.par.txt
Export: Release 12.2.0.1.0 - Production on Mon Jul 31 20:50:02 2017
Copyright (c) 1982, 2017, Oracle and/or its affiliates. All rights reserved.
Username: / as sysdba
Connected to: Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production
Export done in WE8MSWIN1252 character set and AL16UTF16 NCHAR character set
server uses AL32UTF8 character set (possible charset conversion)
About to export specified users ...
. exporting pre-schema procedural objects and actions
. exporting foreign function library names for user SCOTT
. exporting foreign function library names for user HR
. exporting PUBLIC type synonyms
. exporting private type synonyms
. exporting PUBLIC type synonyms
. exporting private type synonyms
. exporting object type definitions for user SCOTT
. exporting object type definitions for user HR
About to export SCOTT's objects ...
. exporting database links
. exporting sequence numbers
. exporting cluster definitions
. about to export SCOTT's tables via Conventional Path ...
. . exporting table APP_BRANCH
. . exporting composite partition BRN_PART_2015
. . exporting subpartition BRN_SUBPART_JAN15 8 rows exported
. . exporting subpartition BRN_SUBPART_FEB15 9 rows exported
. . exporting subpartition BRN_SUBPART_MAR15 9 rows exported
. . exporting subpartition BRN_SUBPART_APR15 9 rows exported
. . exporting subpartition BRN_SUBPART_MAY15 8 rows exported
. . exporting subpartition BRN_SUBPART_JUN15 8 rows exported
. . exporting subpartition BRN_SUBPART_JUL15 8 rows exported
. . exporting subpartition BRN_SUBPART_AUG15 8 rows exported
. . exporting subpartition BRN_SUBPART_SEP15 8 rows exported
. . exporting subpartition BRN_SUBPART_OCT15 8 rows exported
. . exporting subpartition BRN_SUBPART_NOV15 8 rows exported
. . exporting subpartition BRN_SUBPART_DEC15 8 rows exported
. . exporting composite partition BRN_PART_2016
. . exporting subpartition BRN_SUBPART_JAN16 8 rows exported
. . exporting subpartition BRN_SUBPART_FEB16 8 rows exported
. . exporting subpartition BRN_SUBPART_MAR16 8 rows exported
. . exporting subpartition BRN_SUBPART_APR16 8 rows exported
. . exporting subpartition BRN_SUBPART_MAY16 9 rows exported
. . exporting subpartition BRN_SUBPART_JUN16 9 rows exported
. . exporting subpartition BRN_SUBPART_JUL16 9 rows exported
. . exporting subpartition BRN_SUBPART_AUG16 9 rows exported
. . exporting subpartition BRN_SUBPART_SEP16 8 rows exported
. . exporting subpartition BRN_SUBPART_OCT16 8 rows exported
. . exporting subpartition BRN_SUBPART_NOV16 8 rows exported
. . exporting subpartition BRN_SUBPART_DEC16 8 rows exported
...
...
. exporting synonyms
. exporting views
. exporting stored procedures
. exporting operators
. exporting referential integrity constraints
. exporting triggers
. exporting indextypes
. exporting bitmap, functional and extensible indexes
. exporting posttables actions
. exporting materialized views
. exporting snapshot logs
. exporting job queues
. exporting refresh groups and children
. exporting dimensions
. exporting referential integrity constraints
. exporting triggers
. exporting indextypes
. exporting bitmap, functional and extensible indexes
. exporting posttables actions
. exporting materialized views
. exporting snapshot logs
. exporting job queues
. exporting refresh groups and children
. exporting dimensions
. exporting post-schema procedural objects and actions
. exporting statistics
Export terminated successfully with warnings.
C:\temp>
Just remember that its not *totally* the same as a "full" export, because that includes the definitions of the "database" as well (tablespaces, users, roles etc etc).
But you could get all that with a datapump export (or old style export) with rows=n or content=metadata