Both brands are run and owned by the same parent company or you may say under the same umbrella, which is net SE, Germany. But apart from that they are two different activities. They share the same location in the US for cost reasons.
While Meyer concentrates on bringing back their own traditional line of lenses and build up their own production in Germany Oprema is concentraing on bringing back some of the biggest lenses of all times. Production is not taking place at the Meyer shop as we do not want to overstretch our ressources.