Hello Andrew...
Yes , I am fully aware they are not compatible. I saw both companies go through the conversion process. I also successfully ran data integrity checks on both. What I do note though, is both companies had open invoice batches when the data was converted. I don't believe we were able to print the journals when those open batches were posted.
I have run the same tests with the sample data, and have the same results...no posting journal... batch status report says successfully posted.