I’m currently working in an integration were differences of culture between 2 countries haven’t been looked at after one year since the acquisition. I just arrived on the new site and the first thing I was surprised about was how still, after one year, both teams don’t really understand cultural differences and the different perceptions each team can have of the other.
I just asked an integration coach about any tool about culture difference, so here is the website if you want a look at different cultures between countries. https://www.hofstede-insights.com/fi/product/compare-countries/
This is a starting point. Like others have said, checking with employee really brings the knowledge of the different culture and sometimes, talking to other people who have done the same culture integration can give you some insight, but at the end of the day, each company have their own culture and it’s with building relationship and communication you can really get each other.