DBA codes can be shared across different Plan IDs

I understand and read the KG documents. that DBA codes can be shared across different Plan Ids.

My concern is that the 2 different Plans have the same details the only difference is that the Plan IDs are set with Eligibility table of 90 days in effect.hence I had to create a new Plan ID

Eg PLAN id 1 - dba code 6670 is in Co 1. set with Eligibility table of None.

     PLAN id 2 - can this also point to dba code 6670 is in Co 2. set with Eligibility table of 90 days in effect.

The AAIs will point to diff companies... Is there anything I missed or DO I have to create a new DBA code.