Generated by SassMeister.com. http://thesassway.com/advanced/how-to-programtically-go-from-one-color-to-another-in-sass

SassMeister-input.scss

// ----
// Sass (v3.3.0.rc.4)
// Compass (v1.0.0.alpha.18)
// ----

@function color-diff($color-a, $color-b) {
  $hue: hue($color-a) - hue($color-b);
  $saturation: saturation($color-a) - saturation($color-b);
  $lightness: lightness($color-a) - lightness($color-b);

  $function-hue: 'adjust-hue';
  $function-saturation: if($saturation > 0, 'desaturate', 'saturate');
  $function-lightness: if($lightness > 0, 'darken', 'lighten');

  @return (
    #{$function-hue}: -($hue),
    #{$function-saturation}: abs($saturation),
    #{$function-lightness}: abs($lightness),
  );
}

@function apply-color-diff($color, $diff) {
  @each $key, $value in $diff {
    $color: call($key, $color, $value);
  }
  @return $color;
}

$color-a: #BADA55;
$color-b: #B0BCA7;
$diff: color-diff($color-a, $color-b);
$c: apply-color-diff($color-a, $diff);

.adjust-hue{
  content: nth($diff, 1);
}
.desaturate{
  content: nth($diff, 2);
}
.lighten{
  content: nth($diff, 3);
}

.c{
  content: $c;
}

SassMeister-output.css

.adjust-hue {
  content: adjust-hue 19.84962deg;
}

.desaturate {
  content: desaturate 50.70282%;
}

.lighten {
  content: lighten 10.19608%;
}

.c {
  content: #b0bca7;
}