Mm bit different I think. The miners were already the right media's enemy number one when Thatcher came along - the NHS on the other hand is the single most beloved institution in Britain and even the Mail has to pretend to love it. Accusations of Tories selling the thing to a foreign power is something Johnson's very prickly about for good reason, even bone-headed patriot types will be uneasy about this one.
Much as Labour makes a lot of missteps, I think they've played a good hand here. It foxes the momentum of the anti-Semitism smears and rounds off months of back and forth where they accused Johnson of this and forced him to flat out lie about it, at exactly the right time to make maximum impact. I wonder how long they sat on it.