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Yes, Ch_Monster25 is the Minotaur.
As you mentioned, the horn color is different, and this is due to the NES specifications. Also, what you see on the back that might look like wings is actually hair. This also differs in color from the battle enemy due to NES specifications.
The concept of this asset pack is to allow you to create screens that are as faithful as possible to NES specifications. Simply put, the maximum number of colors allocated to one battle enemy is basically 6 colors + black, while walking enemies are allocated only 2 colors + black, making it impossible to be completely faithful to the battle enemy colors. Therefore, I prioritized visibility within the limited color palette.
If you're not interested in NES specifications, this might seem confusing. Detailed explanations are also written in "Detailed guide_En.html", so please take a look if you're interested!