Repeat this mantra: Warmbloods are not breeds. They are mixed horses who are graded or born into registries.
Nice looking horse though OP. Clip and soak his left flank to see if he has a brand.
There are Polish warmblood pintos. Some of those are trakehners who are polish warmblood pintos in the trakehner registry. Never heard of a holsteiner pinto but there might be some. And of course the Samber line out of the Dutch Warmbloods. Samber was allowed into the dutch registry because of his performance in jumping and in dressage and for the color. But all are mixed breed horses. No purebreds.