Sort Column in ETL?

I am trying to import some old Data and merge it with data from a connector but the data is in different orders.  The legacy data went decending

 

1

2

3

4

 

but when I merge the data with the connector its adding to the top so I get

 

5

1

2

3

4

 

I was just wondering, is it possible to merge the data onto the bottom or sort the legacy data so that its all in order, or is the only option to actually sort it within the card?

 

Thanks

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