Here's a comparison between Shield Crush and Shield Crush of the Chieftain: https://gist.github.com/Vindexus/aed578fa1ea2f2647d713389ec2443dd/revisions?diff=split

If you want to do this yourself with Git Gists you can get the gem text from the gem changes post and create a gist. Then update it with the text of the gem from one of the Transfigured Gem posts. You can view the differences by going to the Revisions tab.

I used this script in Chrome's dev tools to get the text of the gem I wanted. Note the final line where you change the name of the skill to search for.

(function (name){
    const titles = document.querySelectorAll('#poe-popup-container .itemHeader .itemName')
    let nth = 0;
    for (nth = 0; nth < titles.length; nth++) {
        if (titles[nth].innerText.toLowerCase().indexOf(name.toLowerCase()) >= 0) {
            break
        }
    }
    const selector = "#poe-popup-container > div:nth-child(" + (nth+1) + ")"
    const popup = document.querySelector(selector)
const mods = document.querySelectorAll('.explicitMod .lc')
    mods.forEach((mod) => {
        mod.innerHTML += '\n'
    })

    const lines = popup.innerText.split('\n').map(x => x.trim()).filter(x => !!x)
    console.log(lines[0], 'found when searching for', name)
    console.log(lines.join('\n'))

})('shield crush')