Best Methods for Enriching Company Acquisition Data

i have a list of 40,000 companies and need to see if they were acquired. the most common example is that when i enrich a company, it's very obvious that the enriched company has acquired the original company in my list. however, sometimes, the enriched company name is different from the original company in my list due to an acronym, or a suffix that is different, but the company has not been acquired. what is the best enrichment option for this?