Is $P(x,y)$ different from $P((x,y))$?

Question

The symbols $P(x,y)$ and $P(z)$ indicate generally the concept of "predicate", but if $(a,b)$ is (ordered) 2-tuple, and in $P(z)$ I have $z=(a,b)$, Is $P(a,b)$ different from $P((a,b))$? .. Thanks in advance!