Both meter on headcount, so send both the same number
Qualtrics writes on its pricing page that its Employee Experience products are priced based on employee count. Workday's G-Cloud 14 filing prices Peakon per employee per year. The first input to both quotes is therefore identical, and the most common way buyers end up with two numbers they cannot compare is giving one vendor total headcount and the other a pilot group. Decide which population you are licensing before either call and give both sales teams the same figure.