Social Login with double form

Hello I have a problem with social login.

In my website I have 2 registration form, one in PageA with fields:

A
B
C
D

And one in PageB with fields:

A
B

Now I want that user make login via Facebook with Social Login Button always in PageA and in PageB but I when the user is on the PageA and click to Social Facebook Login Button the website must show the form with fields: A,B,C,D

When the user is on the PageB and click to Social Facebook Login Button the website must show the form with only fields: A,B

Now show always the form with A,B,C,D also that in the PageB the shortcode is different…

Can you help me please !!!

Are many day that I browse a solution and don’t find anyway

Tks very much for support