Mazda employee here.....
Both gas engine versions of the CX-90 are single turbo 3.3L inline-6 cylinders. The "standard Turbo" is 280hp on 87 octane, the "Turbo S" (hilarious that they made a play on Porsche nomenclature) is the same engine with a hotter tune for 340hp; Turbo S rating is on 93 octane and the regular Turbo is rated on 87 octane so a bit deceptive IMO. Both engines feel pretty similar until the very upper rev ranges. Both of these also use the 48 volt mild hybrid in conjunction with the ICE.....hardly noticeable.
The PHEV uses the standard naturally aspirated 2.5L I-4 Skyactiv engine that has been around for a while now. Combined with the a decent sized battery pack it splits the difference in true power between the 2 versions of the I-6 Turbo engine. EV only range is rated at 26 miles but a more realistic rating is 22 or so in my experience and customer feedback. IMO (again), the PHEV is the star of the line up. Around here, most people can do their daily commute/picking up the kids, running errands on EV only and recharge at night in their home garage on a Level 2 charger in around 2hrs45min from 5 to 100%. Interestingly, we've seed sporadic interest in the lower trims and the majority of the customer interest - so far - has been in the highest trim levels.