The ProBook 445 G6 and 455 G6 are the AMD versions of the Intel-powered ProBook 440 G6 and 450 G6. Aside from the swap in processors, these AMD SKUs will also sport less RAM with no LTE, discrete graphics, or touchscreen options to keep prices at more affordable levels.
https://www.notebookcheck.net/HP-ProBook-445-G6-and-455-G6-with-AMD-Ryzen-are-almost-300-cheaper-than-the-Intel-equivalents.397501.0.html