Labelling of Record IDs in Fuzzy Match Merge Mode

I have just a basic question about how Alteryx labels Record IDs after a Merge Mode fuzzy match. In match results, Alteryx adds a "2" next to one of the Record ID names. (i.e. there will be RecordID for the master and then it relabels RecordID as RecordID2 for data from the second source). My questions are:

1. How can I identify which source fuzzy match labels as RecordID and which it labels as RecordID2? Is there a way to do this quickly and easily?
2. Is there a way I can configure fuzzy match to tell it which source is the master, so I can control which gets labelled as RecordID and which gets labelled as RecordID2?