Did you Google for like, exactly what you are asking for?
https://www.ekwb.com/configurator/waterblock/3831109810491
I found it within 10 seconds.
Can it be used without the waterblock? I’ve been looking for a answer to that and people are saying no because there is no ventilation? What about the backplates that v1tech makes?
Perhaps you should have included this information with your initial posting...it would have made a lot of difference in the responses you received.
You don't have to use the EK waterblock to use the backplate, but there isn't a guarantee it will work other than emailing EK and asking if there are requirements for doing so. I think you are confusing Tom's Hardware for EK product support, please ask the people who will know 100%.
people are saying no because there is no ventilation
Which people? It sounds like you are asking all the wrong people because this isn't only about airflow, it's about a backplate installation which is usually intended to act as a thermal dissipation plate, although this also depends on product design.
EK's site only shows it is a visual match, but not confirmed.