I’ve not seen the Mirren episodes. The Tennison series is a prequel not starring Mirren. I believe Lewis is done.
Mirren was ,in the early 90s IIRC and yes this is a prequel with another woman. Mirren is a great actress and she goes through the trials and tribulations of being a woman detective in an age where that was unusual. This new one is going the same so it looks like that will be the theme of all prime suspects. maybe we’ll have others, bit they need to be dated because nowadays the only new group would be trannies.
The series aired recently on PBS, and has been cancelled.