I concur with Dave, while your photos are not the best if I had to hedge a bet I would be leaning towards S. petricola. S. lucipinnis would never reach 5" TL. That alone would rule out S. lucipinnis, where 5-6" TL is more typical for S. petricola. The problem is this, there are a boat load of hybrid synodontis circulating in the hobby, from all points on the globe, Asia, Czech Republic, etc., so while they could be some rare genetic version of S. petricola that has possibly never been seen before in captivity, they could also be a hybrid synodontis.
Where were they sourced from, and exactly what were they labeled as?
Where were they sourced from, and exactly what were they labeled as?