It’s still important to be aware of the difference. Maybe you want to put in that little extra work to optimize your game even more because one of the systems is falling a bit short. Maybe it works perfectly from begin with and you don’t have to put any extra work into optimizing in the end at all.
With two pcs with similar specs one from either company you can compare really early how they perform with your specific game and how the difference is.
I mean for example Intel CPUs have their L2 cache central for all cores accessible while AMD has one L2 cache for each core separate.
That’s just small differences but depending on how you develop your game this can mean major performance differences which you may want to spend a bit of time to reduce.