Nick did you ever seriously look at what is different?
I had 2 1980 plated FHC Oz delivered cars, which had the same difference at the rear. It was a going to, [gunna do in Ozzie], measure them up accurately, but someone bought the lower car before I got round to it.
There is obviously some difference in the chassis, or control arms, but it was not obvious at a slightly more than casual look at the two.
Hasbeen
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I did make an attempt by measuring at various places but never concluded anything. When changing the springs between the cars I used the top of the fender arch to the center of the hub cap to eliminate the tire variable. The one variable I did not account for is the shock height because I assumed they would ultimately compress to the same length. But this may be a false assumption. I wish I would have swapped shocks as well but that was bit more work than I wanted to invest.

nick
'79 TR7 DHC
'76 TR7 FHC