Google looks at everything. See multiple earlier threads about, for example, g### indexing sitemaps and robots.txt. (To say nothing of the staggering number of idiots who put their raw logs in a place that can be found and indexed-- but that's a different issue.)
Do you mean that you're using the identical buttons with identical text on multiple sites? How much variation is there?
On one hand: If the whole site is about foobars there's no reason for a button to say "foobar features" "buy foobars" etc. In fact it would make it all look suspiciously mass-produced.
On the other hand: if you include the "sizes" or "colors" buttons on sites for widgets that don't come in sizes and colors, then that will get you the mass-produced look.