What is the best choice to implement new screen for A/B testing

Description:

I have a register screen. In order to make it easier for inputting info , I'm planing to renewal this screen by decrease input field. I also want to collect user feedback by doing A/B test. Therefore , I have to keep current register screen and make new one.

I suppose the current register screen has 10 input fields.
And a new one I will make has 4 input fields + a little change about style.

Confusing:

So,I'm wondering about the best way implementation:

• Should I use same RegisterActivity and just separate XML layout ?
• Or I will make a new Activity like RenewalRegisterActivity ( of course new XML layout is created ?

Project structure looks like that :
Case 1:

RegisterActivity.kt   
    regsiter_activity.xml  
    renewal_register_activity.xml

Case 2:

RegsiterActivity.kt  
    register_activity.xml

RenewalRegsiterActivity.kt  
    renewal_register_activity.xml