Google Sheet Data Corrections

I have an existing Google Sheet that’s already structured but contains outdated values. I need a meticulous clean-up: every record in the sheet must be cross-checked against a newer spreadsheet (in Excel format) and corrected where the two files differ... (Budget: $250 - $750 USD, Jobs: Article Writing, Blog Writing, Content Writing, Copywriting, Editing, Microsoft, PDF, SEO Writing, Word, Writing)