We are on OATS version 188.8.131.52,
A. Does note 1470689.1 still applicable for OATS version 184.108.40.206
B. Can we migrate OATS database with OATS application version 12.x into OATS database with OATS application version 220.127.116.11?
C. Are there any compatibility in OATS application versions for source and target for Note id 1470689.1
If you are talking about upgrading the existing repository, you need to use the below document. Usually Database might contain some Data Object changes such as new columns, new tables etc. based on Application Version. So upgrade the entire repository, application using the certified procedure.
OATS:How to Install/Upgrade OATS Using Existing OATS Repository (Doc ID 2466704.1)