Thanks, Susanne! I agree to the categorization as stated in TAI, but there are several exceptions which lead me to believe that that doesn't explain the difference in numbering, assuming that that is consistent.
a) The China Lunar of the Year horses are numbered 82.... And they were made for Kids Land Company (China) Ltd (a company like Toys'r'Us but then in Asia), so they should have been 72.... instead of 82... if the numbering followed the TAI categorization.
b) Schleich's own jubilee figures were numbered 82... also, and they were available through their regular distributors.
By the way, the goat family 82717-18-19 was sold by H & H Winners' Circle in the USA, as far as I have been able to trace.
This leads me to think that there must be another reasoning behind it, so would love further input to solve this mystery!