That could be close. It might be about 33% each. The big question will be, though, not pre-primaries polling, but rather people actually going to vote in the Republican primaries. There, I suspect, Trump will not do as well.
Considering every rally Trump has has between 8 to 15 thousand people, sometimes more, and the fact that Trump has been leading or tieing in the polls at the minimum since he announced, you literally have no reason to suspect that.