The reports from Coinbase and Coinbase Pro do not explicitly state transfers between the two.
In case of MULTI_DEPOT being enabled, this leads to missing coins on either side.
I am unsure whether the two can be considered as distinct exchanges at all.
This hints at that they are not.
Edit:
Just saw that the Account statement on Coinbase Pro does include deposits and withdrawals. I think we should use that instead of the Fills statement. Doesn't fix the issue on the Coinbase side though.