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There are lot's of subtle and a few not so subtle differences, as Henry said above very little is identical to what came before.
From the A7CA Archive, Spare Parts List 1218A shows both high and low frame chassis in detail on pages 55, 56,57 and 58.
As with most Spares lists there are a few oddities but in general this shows the differences (it doesn't note the different nosepiece angles)
The cards may give more information.
Location: Melbourne, Victoria, Australia.
So under the heading Low Frame you have Front Spring Bracket BR155, under heading Low and High Frame you have Front Spring Bracket BR47 with no Front Spring Bracket list individually for the low frame. I suppose this could be a typo?
The plot thickens.
Location: Rokeby, Victoria, Australia
"As with most Spares lists there are a few oddities"
From earlier Spares Lists for the then standard chassis which later became designated the 'high frame', BR 47 is the correct original front bracket.