Best Formula to use for Validation between 2 Columns in 2 Sheets

Good Day,

Looking for some ideas/suggestions for a formula to use to verify values placed in a column in a sheet. In my scenario, I have Sheet 1 and Sheet 2. Within this 2 sheets are 2 columns that need to match. Sheet 1 - Column: 'Product Category' is a manually entered field. This column/field needs to match or flag when it is not matching Sheet 2 - Column: 'product_category', Sheet 2 is essentially a lookup file to assist with data processing with performance data on the backend. So that is why We need a validation essentially that says that we only have current live product categories in sheet 1 and that flags anything that is not on that product look up sheet (sheet 2).

Sheet 1 - Product Category

Sheet 2 - Product_Category

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