No. The Reverse of 99 has a "single" feather in the center of the tail feathers. Study the photo's in the following web page. http://www.smalldollars.com/dollar/page20c.html Additionally, the central feather has a center stem which is in relief and each feather has well defined lines indicating the feather "vanes". Couple the above with the fact that you're looking at two Denver coins. The reverse of 99 was only produced on the Philadelphia coins.
Thanks LindeDad. Have been there several times. It is really the image of the above (obverse) that I can't get over with. The more I compare the two images the more I can see a lot of differences e.g. eyes and mouth of the babies, the eyes of Sacagawae, her mouth, area between the nose and upper lips. Comparing the two pics of Sacagawae above, in my opinion, the image on the left looks prettier. Also, all the 2000P Reverse of 1999 sold at Heritage Auctions carry the image of the pic on the above right. Even the photo of Mark Goodmans discovery specimen features the right pic. (http://www.smalldollars.com/).
I think what you're seeing is the effect of differences in the lighting between the two coins. I'd bet if you compared the coins in hand or retake the images with the same lighting setup you would have different conclusions.