Sorry to hear it, man.
Check
this thread. Colors fade, & it might be best to find one of those scanners to match your paint.
Otherwise, it looks to me like Triumph had 2 suppliers for Racing Yellow paint back in the day, then revived it for 2000. Note that all 3 touch-up kits have the same part number, so should, at least in theory, be the same color.
HTH, good luck,
-Kit