My knowledge of maths and physics isnt the best but I always assumed scale length relates to the distance between two frets (notes, harmonic nodes,whatever you want to call the place where you put your fingers on the string) I would be surprised if the distance between fret at F# on the e string and G on the e string on a 34inch scale bass is the same as the nut to F fret distance on a 32inch scale bass, if its even different by a hundredth of an inch, it will lead to interesting tuning....
jonny