Yes, this is true, each lens has it's own scale so we need to calibrate the equivalent marks.
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For the OP, let me explain what we have to do when replace the shutter in a lens.
If you use different cells in the same shutter then you have to calibrate the scale for the new cells, or you have to use a probe to meter in the camera back. Each lens type has a different compression of the rays in the aperture section so the same aperture trims more or less light.
Scales for lens-shutter combinations could be obtained in the past from manufacturers or service, I guess this is more difficult today.
Anyway we may DIY make the second scale by calibrating light in the back. I did that by attaching a DSLR in the back of the view camera, for a SINAR Norma I attached an extension ring with Nikon F mount to a Sinar lensboard which I placed in the rear standard, in this way I mount a DSLR in the camera back.
Then we may use the DSLR meter to have matching readings in the new scale vs readings with the original lens. I did this two times, one time it was to upgrade a lens after purchasing Symmar-S 135mm lenses because of the MC to shot Velvia. The second time I had a broken Seiko shutter in a fujinon 90 and and I bougth a destroyed lens to salvage the shutter. Now both lenses expose perfectly.
For the time I lacked a shutter for the fujinon 90 I had a second scale in a label on the shutter of the 135mm, so I could use the same shutter with the two pairs of cells, anyway I always mounted the cells at home taking one lens or the other to go.
One thing else, to calibrate aperture we may also use as a reference the metering of the DSLR (or SLR) with a prime lens. For that we may use even a Nikon F65 with the 50mm AF/D using spot meter, it would make a perfect calibration, one important thing, when making the calibration with the DSLR/SLR in the view camera back we have to focus the view camera to infinite, by looking through the viewfinder of the attached DSLR/SLR.
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Some liking to be "hostile" would serve better the community by explaining how apperture scale can be DIY calibrated

LOL