I don't think they look similar, the synchronicity notwithstanding. The sabotage in France was a 250–300 kg rail fragment (per your link). The objects in the Netherlands look much smaller, and look like they're intended to short-circuit two rails to trigger a signal fault. In one place they found car jumper cables with clamps attached to both rails,
https://nos.nl/video/2631081-startkabels-van-spoor-bij-meppe... ("Startkabels van spoor bij Meppel weggehaald")