On a motor rated for saltwater, which just about all of them now, will have the steering arm and tilt tube made of stainless. Also, I think the anodes were different at one time, but now they are probably the same on just about all brands, the material choice being aluminum and magnesium.
2015 Seaark 1872 MV CC Etec-90
Two Helix 12 CHIRP SI's, , MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic
2018 Robalo R180 CC, Yamaha 115
Bitter Gun Owner