Please note that Flaticon and Freepik are different projects from the same company. Although your user account will be valid for both websites, premium memberships do not work in the same way.
If you acquire a premium plan for Flaticon, this will only give you access to the premium resources from Flaticon and the other way around. If you want to have access to the premium features for both sites, you will need to buy a premium plan for Flaticon and another Premium plan for Freepik.
With regards to the payments, since both sites are part of Freepik Company, the confirmation emails about your subscription and the charges that will show in your bank/Paypal statements will all come under Freepik Company name, even if you have bought a Flaticon subscription.