You're talking about the Google referral buttons that advertise the Adsense and Adwords products?
From the Google Adsense program policies:
"A single referral button per product may be placed on a page up to a maximum of 4 buttons, in addition to the ad units, search boxes, and link units specified above. Referral buttons are considered to be βGoogle adsβ for purposes of these program policies."
and a few paragraphs later:
"Competitive Ads and Services
We do not permit Google ads or search boxes accessing Google search services to be published on web pages that also contain what could be considered competing ads or services. ..."
I'd interpret that as "no", but why not use the
Adsense support contact form and ask ?