Rear axle wheel bearing end play 8 3/4

Helping my friend, he have -68 Imp vert and rear axle wheel bearings needs replacing.
-68 FSM says that wheel bearing end play should be between .013 - .023 inch but -69 FSM says that it should be. 008 - .018 inch.
Any idea what's difference between -68 and -69 8 3/4 axle and why are this end play different?
Thanks in advance,
Mika