Is that anyway to compare collective.easyform fields before submit?

Plone Support Add-on Development
1

I am trying to make a form with e-mail and e-mail (confirm) but find no doc about that, can anyone give some hits?

2

collective.easyform does not provide an option for a custom validation on the EasyForm object level (which would be the right place).

You might try to add a custom validator to one of your email input fields and access the "other" value from the request object (which is possible available from a TALES expression on the field level)...that's the blueprint but untested...