What is the different if I connected pt (VT) in the circuit and it has subtractive polarity or additive polarity

Normally in substation (4.16kv, 13.8kv) I see the pt have subtractive polarity but we have new substation 115kv the pt have additive polarity

What is the different if the pt polarity it has subtractive or additive polarity and it will make different