Found some extra info which should shed some light on easilly ID-ing these chips.
Looking at the next 2 pages:
Coppermine: http://www.cpu-world.com/CPUs/Pentium-III/TYP … permine%29.html
Coppermine-T: http://www.cpu-world.com/CPUs/Pentium-III/TYP … Coppermine-T%29).html
You can correctly distinguish between the 2 by looking at their part numbers (you won't have to look up their sspec's).
Coppermines have the part numbers 80526
Coppermine-T's have the part number 80533
FC-PGA and FC-PGA2 chips can also be distinguished by looking at their part numbers, provided the chips are OEM parts, not boxed parts
Have a look at the part in yellow:
RB80526PZ001256
RK80526PZ001256
RB80533PZ933256
RK80533PZ001256
The first 2 are Coppermines while the last 2 are Coppermine-T's
When the yellow letter is a B, the package will be FC-PGA
When the yellow letter is a K, the package will be FC-PGA2
Hmmm...I should take a look at my chips in the attic...
But either way, I know of no care in real life where Coppermine or Coppermine-T actually make any difference.
Both work in Coppermine boards and will behave exactly the same
Both work in all Tualatin boards I've seen till this day (just check cpu-upgrade.com), and even if the Coppermine-T has a slight advantage over Coppermine in a Tualatin board, I'd rather put a real Tualatin in there anyway 😜
Well, hope this answers it for you! 😉