Need an importer made for my website

So I have multiple distributors so I need multiple importers made my distributors are overclockers uk and spire now I have a importer made for overclockers csv to import those products however I need one made for spire CSV as there CSV layout is different to overclcokers. Now some of the products will be duplicates so to counter this I want the spire importer to import the products and search my shop for the mpn if it's find a marching MPN then have it see which price is lower overclockers or spire if spire is cheaper then just change the price for that product and the quantity Get in touch with me if this doesn't make sense