Disaggregated COT Data, Backcasting, and Graphs

Beginner Questions
1

I downloaded the historical disaggregated COT data in the hopes of graphing commercial, non-commercial and retail trading patterns for some backtesting.

However, the disaggregated data divvy’s up the 3 categories into Dealer, Asset Manager, Leveraged Money and Other.

How do these categories correspond to commercial, non-commercial and non-reporting categories on retail?

Also, are graphs such as this: Historical Charts of Interest showing net changes in the positions only?

2

I think that is net changes in positions only, Take a look at Current Commitments of Traders Charts and Charts | Timing Charts.