List price with tax for display means

Yes, it’s the same thing.
Amazon UK
The Recommended Retail Price (RRP) is the suggested or recommended retail price of a product set by the manufacturer and provided by a manufacturer, supplier, or seller. Amazon will only display an RRP if the product price applied in Amazon.co.uk or by at least one retailer was at or above the RRP.

Amazon .com (US)
The List Price is the suggested retail price of a product as provided by a manufacturer, supplier, or seller. Except for books, Amazon will only display a List Price if the product was purchased by customers on Amazon or offered by other retailers at or above the List Price in the past 90 days for non-seasonal products (like TVs and Headphones) and in the past 180 days for seasonal products.