I have a field of type Number which has an internal name inside SharePoint as EMQRInternalStage, and when i add it inside my powerapp i got it as a DataCardValue3. now i can define a formula to either use the internal name or the datacard name, so i can say:-
If(EMQRInternalName = "1")
OR i can say
If(If(Value(DataCardValue3.Text)=1)
so what is the difference between using the internal name of the field or using the DataCard name?