The bull looks much like a Pajuna, but the horns do not fit at all. They are much larger and upright than in Pajuna - maybe it's another cross with Maremmana, or a different type of cross. It is hard to guess based on the looks of the animal alone. Here are some cows from Keent. Based on colour and horn shape they might be Sayaguesa x Maremmana crosses, but could also be anything else.
I also found two new videos of the herd at Milovice, Czech Republic. This video shows, additionally to the bull that looks a bit like a Texas longhorn, two new bulls (6:48). I don't know if they are descendants of the cows in the herd or if they have been moved to the herd recently. Based on their looks they might have Pajuna in their genes. The other video shows some atmospheric shots.
Looking at the pictures and videos, horns protruding outwards or having a corkscrew-like shape are very common in TaurOs cattle, additionally to upright Maremmana-like horns. The goal should be horns facing forwards and inwards as in the aurochs. Of the breeds used in the project, Maronesa is the only one that has inwards-facing horns on a regular basis. So the horn shape of TaurOs cattle can be improved by producing a number of good Maronesa crosses with inwards-facing horns and using them as breeding bulls at their numerous breeding sites. Otherwise it might become rather difficult for the project to achieve aurochs-like horn shapes.