Definitely not the same.
Navionics shows various passes but no detail anywhere else.
The Current Atlas shows currents everywhere in its area.
I haven't looked at mine in a while, but IIRC, the currents are shown for small tidal changes and separately for larger changes, so you can find the size change you are in, then look at the location you are in, wherever in that area. You don't need one that references cates at all, so one issued (like my own) 30 years ago is still useful.
Real handy if you are looking to do a passage where there are known back eddies, like along the shore of Stanley Park while heading towards First Narrows, or along Spanish Banks, while racing small sailboats in the area.