Cardio wise you are prolly fine. But you are using different muscles and putting wear on different body parts.
17 miles is very long commute for the best of folks. For just starting out it's HUGE!!! You sir are a beast. Your one-way distance is just about what I do round trip.

As hubcap said you are to be commended for not over thinking this thing. Too often I am guilty of waiting until every planet aligns before I think I can do whatever it is I am wanting to do. An old timer once told me--on a different subject--"Give 'em hell with whatever you got." (A lesson I have yet to learn.)