The unmarked 131 proof is batch 18. It was the A (First) batch release in 2022. They moved to 3 batch releases in 2023 and they started putting batch numbers on all bottles with 22B.
Obviously taste is very subjective and each year is different on the SiB and CYPB but…last year I thought the CYPB was MUCH better and had the SiB below it and the Full Proof. Full disclosure I do usually prefer higher proof.