Walz P 0,0 filter? Similar to X0 or Wratten 11?

I ended up getting a Walz P 0,0 filter with some other stuff I just bought for my Rolleicord. It looks a lot like a yellow-green (Cokin) X0 filter I have, so I'm pretty sure it's roughly the same, and the sparse mentions on the intertubes seem to agree. Am I wrong? Anybody have further details on it?

I found this on eBay, and there is the paper that came with the Walz filters. It's indeed a normal yellow-green filter. https://www.ebay.com/itm/383937163597

The hue of the yellow-green filters from different manufacturers vary a little but the effect is the same to human eyes. The colour temperature outdoors can be different from hour to hour, or change in an instant when a cloud gets in front of the sun. And different films have different spectral sensitivity. Perfect consistency is hard to reach unless in a controlled enviroment.

Thanks very much, JPD, for digging up that reference. It's what I wanted to know.