[BiO BB] protein identity

[nabula easter]

Hi Group.
  When two proteins are 98-99% identical, what is the
relationship associated between them. 
 Can we call those proteins as very close homologues !
or that 2% difference between then is due to sequence
errors at Nucleic acid level.
At nucleic acid level they would be 94% identical and
we can say a sequnce error!
  I have this confusion ! could any one please explain
this and help me out of this confusion 
Thanks
Cheers 
Thrio 

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