Back in 2016, actor Lamont Thompson was on Days as Detective Hayes (during the Jade and Joey runaway storyline) and literally on those same days, he was appearing on Y&R as Warden Pullman, even though he taped the shows months apart.
And when Aaron D. Spears was playing Commissioner Raines on Days, he was back to appearing on B&B as Justin Barber, with months between when he taped Days and when he went back to B&B.