What do you call 2 boolean functions which are equivalent if two arguments exchanged?

Question

What do you call boolean functions which are identical accurate to argument order?

EDIT1

I meant not symmetric function.

I mean, for example, implication function with truth table

00=1 01=1 10=0 11=1

and the function

00=1 01=0 10=1 11=1

i.e. giving the same if arguments exchanged.

What do you call the relation of these functions to each other?

I.e.

$$f_1(x_1,x_2,...,x_k,...,x_l,...x_n)=f_2(x_1,x_2,...,x_l,...,x_k,...x_n)$$

i.e. the positions of arguments $k$ and $l$ was exchanged, which gave different function.