Considering becoming a seller – kdp vs seller?

Hi all, I just started making low content books on KDP until I realized that I can’t make blank journals with a bunch of different colors of the same cover and same interior, as I read amazon will likely block you from posting “duplicates”. If I were to register as an amazon seller instead, would I be able to have low content books printed through KDP? Or is that something only available to KDP publishers? I may want to sell other things as well alongside low content books (journals/planners) so it would be great to do both under one seller account. Thanks!