No. The spokes could be a couple millimeters shorter, but since you're using box-section rims, it doesn't really matter. The threads in the nipple are fully engaged, and that's the important thing. If you were using non box-section rims, the spoke projecting past the end of the nipple could easily puncture the inner tube, and must be filed or cut flush with the end of the nipple. But with a box section rim, as long as the spoke end doesn't project past the rim bed, there's no problem.