Just for the record.
After kindletool extracting the Gen7, Gen8, and Gen9 amazon bin installs, ungzipping and, untarring the voice folder, I find
Code:
# MD5 checksums generated by MD5summer (http://www.md5summer.org)
# Generated 2018-05-22 14:49:19
ee7203754daa40795b8fd73b668e7118 *lang_en_us.dat
42cc8be489b96ecba547277a872bf252 *vox_en_us_salli22i
...The exact same MD5.