Yes you can simply:
1) Go in to the Load Editor
2) Unlock the "Auto-generated section" if you haven't already done so
3) Remove from the fields the first part of the name the text "Legacy-" so they get exactly the same names as in the preceding table.
4) You can delete the last field with the name [NonEpicorSales2017.Legacy-TerritoryId_GeoInfo]
5) give the now remaining two last fields the same name [Country_GeoInfo]
that is [QlikView-InvoicedSales-Including-Corsham.Country_GeoInfo]
Then all field names match and Qlik Sense will use something called auto concatenation which appends the second table to the first since all the field names are exactly the same.