The DDR5 version of Signature Premium carries the same name as Patriot's DDR4 line but nothing else about the platform is shared — this family actually spans two different speed grades rather than one fixed rating.
Listings here run from one end of 5600 MT/s up to the other at matching CL46, and a 16GB kit at the lower grade is not the same product as a same-capacity kit at the higher one — read the specific listing rather than assuming uniformity. Configuration across the range is given as 1×16GB.
As with any DDR5 UDIMM, the rated speed only applies once the board's memory profile is enabled in firmware; left on defaults it runs at a lower JEDEC speed instead.