Hi, LineDrive!
What is called “fields” in most other systems (i.e. Salesforce, ACT, Marketo, etc.), HubSpot uses the term “Properties.” So yes, they’re one and the same.
To see a full list of their default properties, I highly recommend the articles below. I use them all the time when I need a refresher.
Default Contact Properties: HubSpot's default contact properties.
Default Company Properties: HubSpot's default company properties