Give this a try
| rest /services/admin/LDAP-groups splunk_server=abc
| mvexpand roles
| search roles=admin_user
| stats count by users | table users| eval from="admin_users1"
| append
[| rest /services/admin/LDAP-groups splunk_server=xyz
| mvexpand roles
| search roles=admin_user
| stats count by users | table users | from="admin_users2"]
| stats values(from) as from_combined by users
| eval type=case(mvcount(from_combined)=2,"admin_users1 admin_users2", from_combined="admin_users1","In user1 only", true(), "In user2 only")
| makemv type | mvexpand type
| eval temp=1
| table temp type users
| chart values(users) over temp by type
... View more