There is quite a bit of variation within Pacific Rhododendron. DNA studies indicate there are about 4 clades in plants sampled from north+western California , north to Canada. See;
https://scholar.lib.vt.edu/ejournals/JARS/v60n1/v60n1-xi.htm
Prior to that two members of the American Rhododendron Society explored the Oregon Cascades near Detroit, Oregon for a few years trying to find plants with color variations. Their, and others', findings indicate the color of Pacific Rhododendron can range from white to dark pink. Summaries of, including photographs of color variations, their field trips can be found in the Journal of the American Rhododendron Society:
https://scholar.lib.vt.edu/ejournals/JARS/v40n2/v40n2-boge.html
https://scholar.lib.vt.edu/ejournals/JARS/v41n2/v41n2-boge.html
and
https://scholar.lib.vt.edu/ejournals/JARS/v42n3/v42n3-boge.html
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