I have examined a block of four of the 2P2 with horizontal watermark and cream paper, and two blocks on white paper with horizontal and vertical watermarks. While the 2P2 with horizontal watermark on cream paper resembles the 2p2D, the diffused paper, I have not found this stamp used between 1943 and 1947, which is the period of usage for this paper.
Here is the 2P2 with horizontal watermark. It does look like the 2P2D.
Here are the two white paper blocks. These blocks are the 2P2C paper.
First block, vertical watermark
Second block, horizontal watermark
Here is a comparison of the 2P2D candidate block and one of the 2P2C blocks, both with horizontal watermark.