That Obbink footnote also references Cicero's De Finibus, I.62, as another instance where the Tetrapharmakos is restated or paraphrased (emphasis mine):
QuoteThe conclusion is that no foolish man can be happy, nor any wise man fail to be happy. This is a truth that we establish far more conclusively than do the Stoics. For they maintain that nothing is good save that vague phantom which they entitle Moral Worth, a title more splendid than substantial; and say that Virtue resting on this Moral Worth has no need of pleasure, but is herself her own sufficient happiness. 62 "At the same time this Stoic doctrine can be stated in a form which we do not object to, and indeed ourselves endorse. For Epicurus thus presents his Wise Man who is always happy: his desires are kept within bounds; death he disregards; he has a true conception, untainted by fear, of the Divine nature; he does not hesitate to depart from life, if that would better his condition. Thus equipped he enjoys perpetual pleasure, for there is no moment when the pleasures he experiences do not outbalance the pains; since he remembers the past with gratitude, grasps the present with a full realization of its pleasantness, and does not rely upon the future; he looks forward to it, but finds his true enjoyment in the present. Also he is entirely free from the vices that I instanced a few moments ago, and he derives no inconsiderable pleasure from comparing his own existence with the life of the foolish. More, any pains that the Wise Man may encounter are never so severe but that he has more cause for gladness than for sorrow.