Hi LeadSled!
I agree with your explanation of equi-fuel, but it is NOT the same as PNR. PNR is the latest point which you have sufficient fuel to return to point of departure or alternate. It has no relationship to distance to destination (except it would be wise to have enough fuel to reach it!). It can be overhead destination, or even past it. It is the last point at which a continue, return/divert decision must be made.