Solaris Sparc x86

I downloaded a CPU patch (19.15) for a Solaris Sparc system, but I was surprised to find the downloaded file to state the CPU type but it just says SOLARIS64

In the readme itself I didn't directly find a reference to the CPU type (Sparc versus x86)

So, how do I know the CPU type, from the file itself ?

I suppose it must be different for both "platforms", but I get that the name you get from the downloaded file, is the same. So, from looking at the name only, you cannot known. The CPU patch numbers are the same for other platforms, so the number is not an indication.