The height of the second pyramid by petrie 5664 ins +- 13 inches 472 feet. So within the range I wish to suggest 471 imperial feet for these reasons.
1. A simple value for pi is 3.14 and 3.14 x 3 = 9.42 as soon as you see 942 you say pi. 1/2 of 942 = 471.
2. The second pyramid is a 3 4 5 pyramid and using that logic 471 = 4 so the 1/2 base 3 = 353.25 base equalling 607.5 imperial feet.
3. Some may say 'no Jim that is an odd number means nothing' well that is not correct because it leads to the old problem of 'sqauring a circle', not exactly the same as the Great pyramid.
4. The perimeter of the second pyramid 607.5 x 4 = 2,826 imperial feet and this is an even number. Our original value for pi 3.14 divided into the perimeter = 2,826/ 3.14 = 900 imperial feet. The architects have taken a circle diameter 900 feet and created a square.
It reminds so much of the Great Pyramid laid flat, not the same though, with a diameter of 1800 Indus/Saxon feet 13.2 inches (1980 imperial feet).
In the second pyramid they have used the height 471 x by a simple 3 = 1413 and x 2 = 2826 the perimeter of the pyramid.