Did the tank come with the substrate? Was the substrate wet and kept between 70-80F durring the move?
If so then you should still have a good bactera bed in the 45. If you want to give you cycle a BOOST and can spair a few cups of substrate from your existing 10 gal
tank move a few cups of substrate over into the 45. This will also give your bactera population a jumpstart.
I have done this for years with my freshwater tanks and the net result is a very small/short cycle.