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wis scrambler vs 64/66 scrambler


In the blue book the wis scrambler is x7+x6+1, only the
6th and 7th term are xor and feedback to the beginning 
of the 7-bit shift register.    

However, in the 64/66PCS section x58+x19+1 is used but
this time the scrambled output xor 58th xor 19th and 
feed back to the beginning of the 58-bit shift registers.  

The two equations are very similar but the drawing in the
bluebook suggested otherwise.  Also, base on the drawing,
the wis scrambler/descrambler would be the same while the
64/66 scrambler and descrambler are different. I must have 
misunderstood some fundamental.  I hope someone could clarify 
this for me.

Thanks in advance.

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