The source is the same, the path to it is different. Personally, I view Runes as the source and Techniques as the means. A God, a spirit or a sorcery spell (the structure you create then casting a sorcery spell) is the catalist for the power you call forth. Sorcery cuts out the 'middle man', of course since the sorcery spells are not pre complied (sorry for IT terminology 🤪 ) they take more time to learn and cast.