No. Say I am bidding 1.00 per click for desktop clicks. I can set smartphones to 40% of the desktop bid ($.40ea) or I can set them to 100% ($1.00) or I can even set them at 140% ($1.40) if I think I'll do better with mobile. Basically I can set them to any percentage I want (including 0% if I don't want them to show up for mobile at all) The *default* is to bid them at the same rate as desktop, but I can adjust up or down depending on who I'm targeting.
But I can no longer do the same with tablet bids, because Google has decided that tablet behavior is close enough to desktop behavior that separate bidding is unnecessary. Many advertisers (including myself) disagree, but they didn't exactly ask our opinion.