It is the same basic move for a yarn over whether the yo is preceded by a knit or purl stitch. The yarn goes from the bottom of the right needle in front of the needle to the top of the needle and then down the back. If it is purl yo purl or knit yo knit, the yarn makes a full 360 wrap around the needle. If it is knit yo purl, the wrap is a bit more than 360 and with purl yo knit it is a bit less than 360.
If you point your needle at your face after your yarn over, the yarn should be wrapped in a counter clockwise direction. If it is wrapped in a clockwise direction, you have made a reverse yarn over which you rarely want to do (some patterns specify this stitch in order to have smaller holes in the lace).
I'm a continental knitter (picker) and as pdxknitterati stated, it is the same no matter which style you knit.