To my knowledge, there is no such document on v5.2 to v6.0 mapping. And in my personal opinion, such document may not be necessary. A major difference of v5 and v6 is that v6 has several new tables being added to CDM, such as SURVEY_CONDUCT, and LOCATION_HISTORY. However, if your source data does not carry these information, nothing need to be done there. Another variation is that in v6, some new fields are added to the existing tables, e.g., Latitude and longitude added to LOCATION table, NOTE_EVENT_ID and NOTE_DOMAIN_ID (NOTE_EVENT_TABLE_CONCEPT_ID) added to NOTE table etc. Again, if your source data does not have these information, you don’t have worry about them.
Having said above, I do think several things needs to be changed when moving from v5 to v6. For example, DEATH table removed and cause of death now stored in CONDITION_OCCURRENCE. Also if your v5 has COST table populated, person_id should be added to this table in v6. Without knowing what your v5 CDM and source data look like, it is hard to give more detailed instruction.
One other thing to note is that an Oncology Extension Model is added to v5.3 and v6. If your v5.2 has oncology data, your may consider using this extension. But that is a whole new topic.
Hope this helps. My two cents,