301 & backlinks

[martyc]

Apologies if my question sounds like a school Maths lesson

If you have 2 sites:

Site 1) is linked to by sites A,B & C

Site 2) is linked to by sites X,Y & Z

You then 301 redirect site 2 to site 1.  Most of the juice from site 2 (obtained from links X,Y,Z) should be passed over to site 1.

But what if site 2 is linked to by the same sites A,B,C as site 1 instead of X,Y,Z.

Since both sites have exactly the same links will the same, less,  or any weight be passed over by the 301 redirect?

Many thanks.

[ZeroWing]

I think this would be the same as adding the same backlink twice to a site. If so, Google will only give credit for one. I just noticed I am answering a question from 2011, but got here trying to answer a question of my own about backlinks. Hopefully, Marty has already figured this out, but I am fairly certain I am correct about the link juice passed. It only counts once.

[Syed1]

Its difficult to say what happens exactly in this scenario but some value of the links might be discredited as Google's algo may be able to identify the relation.