No all that is the same in modern SaaS startups. If you're not in the business of HR you don't innovate the HR. So everyone goes and uses Gusto or Rippling. Everyone uses Github. Everyone uses a Mac.
But the parts that you're aiming to innovate on it doesn't make sense. And that's all the actual pieces of business: your software, your sales and marketing, how you do customer success, etc etc
All that process has commonalities with other companies but ultimately has sufficient difference that experience is worth it to spot what to do, but you can't just copy. It's just like software in that sense.
The only exception are the "copycat startups" which see someone else hit PMF and then fail to scale the solution to capture the market. In that case, you go after their market faster without any of their legacy (not just in software, they may have large customers they do special deals with etc).
But the parts that you're aiming to innovate on it doesn't make sense. And that's all the actual pieces of business: your software, your sales and marketing, how you do customer success, etc etc
All that process has commonalities with other companies but ultimately has sufficient difference that experience is worth it to spot what to do, but you can't just copy. It's just like software in that sense.
The only exception are the "copycat startups" which see someone else hit PMF and then fail to scale the solution to capture the market. In that case, you go after their market faster without any of their legacy (not just in software, they may have large customers they do special deals with etc).