I don’t know the nodal distance of the 150/4 APO Rodagon N. However, I have the nodal distance of the 150/5.6A EL Nikkor (1.2mm). That would inflate the true negative-to-print distance by 1.2 mm compared to the calculated value for the EL Nikkor. The error is small enough that the calculation is still sufficiently accurate for a reasonable estimate.
The nodal distance of the 150/4 APO Rodgon N is likely not greatly different than that of the 150/5.6A EL Nikkor.
A greater potential calculation error is the true focal length of the lens. A good example of this is the 50/2.8N EL Nikkor. Nikon gives its true focal length as 52.0 mm—4% greater than marked. Some makers supply this information. Others simply state the nominal focal length only.