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input.scss

/*

<div class="layer bgWhite">…</div>
<div class="layer bgGold">…</div>
<div class="layer bgWhite">…</div>
<div class="layer bgWhite">…</div>
<div class="layer bgGold">…</div>

*/


.layer {
    
    @each $bg in (bgWhite bgGold) {
        &.#{$bg} + &.#{$bg} {
            margin-top: 0;
        }
    }
    
    /*
        wish I could match complete selector
        e.g. "any .layer.bgWhite + .layer.bgWhite"
    */
}

output.css

@charset "UTF-8";
/*

<div class="layer bgWhite">…</div>
<div class="layer bgGold">…</div>
<div class="layer bgWhite">…</div>
<div class="layer bgWhite">…</div>
<div class="layer bgGold">…</div>

*/
.layer {
  /*
      wish I could match complete selector
      e.g. "any .layer.bgWhite + .layer.bgWhite"
  */
}
.layer.bgWhite + .layer.bgWhite {
  margin-top: 0;
}
.layer.bgGold + .layer.bgGold {
  margin-top: 0;
}

settings.json

{
  "sass": {
    "compiler": "dart-sass/1.32.12",
    "extensions": {},
    "syntax": "SCSS",
    "outputStyle": "expanded"
  },
  "autoprefixer": false
}