The Garmin Forerunner 745 is basically a Forerunner 945 Lite. For all intents and purposes, that’s a good thing. It means that you get pretty much all Garmin’s best endurance sport technology, in a frame that is considerably slimmer than the Fenix series.

On the other hand, the Fenix 6 Pro includes all the features found in the FR745 (except recommended workouts), and a lot more, including:
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https://5krunning.com/garmin-forerunner-745-vs-fenix-6-pro-product-comparison/