Actually I noticed that the wig is a very dark brown-black and not full black like I had thought at first; the ponytail is black but luckily the color differences aren't disturbingly noticeable. Personally I don't really mind at least not yet xD that the colors don't match perfectly... it's understandable seeing the wig and ponytail are from different eBay sellers and wig colors are hard to match perfectly anyway. The difference is a bit noticeable when both wig and ponytail are hit by the light at the same time but otherwise okay. It will do just fine for me.
I will use this for Toshizo Hijikata's first season version from now on at cons, I think, because it's easier to care for. That longer wig I will save for private photoshoots and when I do his calendar version. Also this combination works for another character I have in mind too, but I won't reveal that one just yet ~