I have "the real Parkdirektor" growing in my orchard now. I say real because I thought I had it all along in my garden, but that was probably a mis-identification. The real Parkdirektor I grow comes from De Wilde in the Netherlands and differs from my mystery garden rose in the form of the canes, the waviness of the petals and the colour (Parkdirektor Riggers has a very deep velvety red shade in full sun).
When you want to identify a rose there really is no way around it, you have to plant the contenders alongside it for comparison. The differences can be soo subtle, at least when you don't have 50 years of nursery experience.