I was unable to find this hybrid, possibly a simple label mistake?
There is a hybrid called Korat Sunset which is C. Waianae Sunset X Rlc. Lucky Strike. The "t" was changed to an "n" inadvertently? But there are awards for this as a large standard Purple Cattleya.
There is a registered hybrid called Rth. Kotan's Sunset which is C. Hazel Boyd X Rlc. Pastel Queen which is a smaller art shade flower. Either could be a parent perhaps but there is not a Blc. Koran's Sunset registered.
As for your second parent, I would check with the vendor if you can. A hybrid can't be properly registered with the RHS as a number, in this case 24256.
It is a shame not to have a proper name for this attractive little plant. Hazel Boyd by Pastel Queen seems more likely but further digging is warranted.
I wish all vendors would care about the names of plants that they sell.
It could also be Koltan's Sunset and the number 24256 is NOT a parent but simply a vendors catalog number?
