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Each track is one frame. The length of the track is set by the diamter of the drum. The A format drum was larger than the IVC 700 drum though I'd have to search for the dimensions. From memory it's c130mm diameter for A and C format, perhaps c115mm for IVC. The video tracks are therefore very long, around 400mmm for A or C. This was a strength and a weakness. Good because one frame per track allowed C format to do all sorts of slowmo/stopmo effects. Bad because it makes mechanical alignment very critical and a portable machine more difficult. The Bosch B format with segmented scan had a much smaller drum but needed framestores to achieve slowmo etc. These were very new and expensive at the time. Very few broadcasters used B format.
I don't think it would be possible to distinguish 625 from 525 using a magnetic viewer. In theory you can count the line pulse but I think you'd struggle to see them.
The audio tracks are in a different position on A and C format, as is the control track. I think simply rewiring the audio and control heads would give some kind of result but I never tried it.
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