Right, but the difference in your example is because of the precedence affecting powers of parens. Your examples have fallen afoul of the "if it looks like a function call it is one" rule (see perlfunc). It's the difference between print (42+23)*2; and print +(42+23)*2;; the parens change where the LIST of arguments to the list operator begin.

(Not that you're wrong; it is a case where the literal code is different. I just wanted to point out that the difference is because of what the actual parsed code works out to be rather than it being that stuff is behaving different as map EXPR, LIST versus how map BLOCK LIST would, which I think was what's being asked.)