Manta XFinity is V-Color's RGB DDR5 kit, built as 288-pin UDIMM and sold in two capacities at a single shared speed grade.
6000 MT/s CL30 applies across the family, so 32GB — reached as 2×16GB at the larger size — is the only decision the listings actually present; the timing stays fixed either way, and neither capacity reaches its rated number until the board's XMP profile is turned on in BIOS.
Lit kits tend to run taller than plain heatspreaders, so it's worth checking cooler and case clearance before capacity, not after — especially in a smaller case where a tower cooler already crowds the top DIMM slots.