two different registration form (new)

hi
i want have two registration page for my site
register form 1
field 1 : requierd
field 2: optional

register form 2:
field 3 : req
field 4: optional
field 1: optional

is it possible?
i search about this but it's little different vs my need.
can i use this extension?:
www.joomduck.com/extensions/community-builder-profile-pro

Yes, you'd just use CB Conditional to show/hide fields/tabs based off the value of your profile type field. See the below CB Conditional product page for details.

www.joomlapolis.com/addons/cb-conditional

You can try this out on our demo site below.

demo.cbdemosites.com/

are you focus on the field 1 in these two forms?
in case 1 it's not optional and in the second it's optional.
cb conditional only show and hide with css. right?

CB Conditional simply shows or hides fields or tabs based off the value of a field. It can not make a field required or not. You'd have a field to select the type of profile then condition fields to show or hide based off that to get two different registration forms.