Goseki Kojima-Zodiac llustration

I don´t know much about this piece, besides it seems to be of a series about the zodiac he made at some point.
That is irrelevant to me. Even when this is the farthest to Lone Wolf and Cub I can imagine,having an original by Goseki Kojima is just amazing for me. I did not think I would get the chance EVER.
Having said that... look at the colour paletter used for this piece... isn´t it the same as he used for the Path of the Assassin and Samurai Executor? Did these colours come out of the same watercolour powder, did he use the smae brushes? Now is when the geek inside of me comes out...