"Measurement of Starlight", J.B. Hearnshaw

I am interested in automated stellar classification using artificial
neural networks (ANNs). My background includes electrical
engineering, plasma physics and ANNs.

I bought "Stars and their Spectra: An introduction to the
Spectral Sequence" , 1989, by Kaler and am looking for additional
reference books relevant to the subject. I am planning to buy
"The Classification of Stars", 1990, by Jaschek & Jaschek and was
considering "The Analysis of Starlight: 150 years of Astronomical
Photometry", 1990, by J. B. Hearnshaw. However, Hearnshaw has
a new 2005 book "Measurement of Starlight; Two Centuries of
Astronomical Phototometry" .

Is the 2005 book considered an updated version of the 1990
book and a sufficient alternative for my purposes?

TIA

Greg