Radio Compatibility Chart

Some memory is telling me that 1969-1971 c-body radios have a different curvature than 1972-1973 c-body radios. Is that true?
@halifaxhops posted this chart on FABO.
1972 - 1973 pn are the same. 1971 is different

2580 766 MoPar 1968 Imperial Search tune AM PB radio
2580 786 418 Mark 1 MoPar 1968 Imperial T&C AM PB radio
2580 786 MoPar 1968 Imperial Search tune AM PB radio
2649 963 CE59014 MoPar 1969 Plymouth Valiant AM PB radio
2820 632 240 MoPar 1968 Plymouth AM PB...

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Author: 1970FuryConv