The two films have nothing in common except that
Something Wicked this Way comes (1983) is also a horror film. It was based on the novel by Ray Bradbury about a diabolical circus. The title was taken from Shakespeare's Macbeth at the beginning of the first act when one of the witches declares: "By the pricking of my thumbs, something wicked this way comes".
The Wicker Man (1973) is based on a novel by Andrew Shaffer and its main theme is a pagan religion.
Isn't it typical that the Franch rating for the original was 12 years and older, while the remake will probably get a rating for 13 or 15 years and over!