Trump's leads in both polls are at or inside the margin of error. Previous results show Trump usually underperforms his poll numbers while Cruz outperforms his. There are exceptions though, most recently New York.
In the Fox News poll, men heavily favored Trump over Cruz 44% to 33%, but women favored Trump by only 3%. Although the Fox poll has Trump up by 8 points in likely Republican primary voters, when the poll narrows that group to self-identified Republicans Trump's lead shrinks to 3 points. That suggests that Indiana's open primary system which permits Democrats to vote in the Republican primary could aid Trump.
Indiana has 57 delegates at stake, 30 are awarded to the statewide winner. The remaining 27 are apportioned three for the winner of each congressional district.