Probably a and b are fragments of the same quipu.

Groups: irregular

Colors: browns, blue

Color combinations: monochrome, speckled

Strings: main, pendants, secondary

Ply: all S

Diameter: main 5mm, pendants 1,8-2,5mm

Recto/verso (tying pendant to mainstring):fragmented main

Knots:1/1 endknots (like a single knot), 1/2 endknots (a single knot securing the pendant tied with only part of the pendant as active), 8, long knots (Z), single knots (Z)