I guess your question is: Should you as pilot be able to judge the distance with more accuracy at the beginning or at the end of the turn. If you turn from your side to the other, then it's the beginning and vice versa.
I never heard of any restriction or any rule.
The only written procedure you receive is from Airbus on small runways. It's always from your side to the other. The thought behind is, that if you do it right in the beginning, you have a good chance to succeed.
Dani