YahooFeedSeeker does use Google Blog Search Pinging Service?

I am currently playing with Google Blog Search Pinging Service. While looking at the raw logs I've noticed the yahoo's YahooFeedSeeker came to my site right after the Googlebot:

66.249.72.67 - - [24/Dec/2006:19:35:46 +0300] "GET /sitemap.xml HTTP/1.1" 200 251 "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)" qwerty.legaliz.info "-"
216.39.58.17 - - [24/Dec/2006:19:43:15 +0300] "GET /sitemap.xml HTTP/1.0" 200 251 "YahooFeedSeeker/2.0 (compatible; Mozilla 4.0; MSIE 5.5; http://publisher.yahoo.com/rssguide)" qwerty.legaliz.info "-"

I haven't sent any other blog pings (i.e. I did _only_ manual ping). So I suspect that YahooFeedSeeker does use changes file exported by google in some way.