You can download the official SK4 rules in PDF at MMP.
This includes all past extensions.
Just ignore what's not relevant for you (guns, vehicles, PTO, ...)
How "complete" is Chapter H ?
Does it include all extensions (FKaC H49 to H76E, DB H131 to H142, AoO H143 to H172, ...) ?
What about chapters O,P,Q,R,T,V ? Will they eventually be merged or come standalone ?
Indeed I never noticed the slight nuance of the routing trigger between both rules.
I guess they tried to have a more simple/consistent rule for the SK, since you check the same "interdiction" condition for the starting hex and the subsequent routing hexes.