category same as category page name OK?

Site URL: https://www.rebelrebel.co.uk/scented-candles-v2

I apologise if this is basic, but do you suffer from duplicate content problems (on search) if you use the same name for your category as your category page?

This site has not used categories and instead created multiple store pages and then created normal pages with summary blocks of the related store.  This means that both the store page and the normal page have SEO title/desc options.  It is difficult to set these so that they do not compete with one another in search.

They could use categories (you might say they should!) However, given their wish to use the page design features offered in Squarespace, if they were to move to the use of categories and tags they would want to create 'category pages' in the same way as they are creating normal pages now.  So a similar question arises.  Can you use a category name which is the same as a page name without creating duplicate content in search?

Any advice/guidelines would be VERY MUCH appreciated.

thanks