Are there two camshaft Position sensors?

Yes. That engine has 4 cam sensors. Bank 1 intake and exhaust and Bank 2 intake and exhaust. Might I ask if you have a code for one or more and what the code is?

You mean timing chains were done? All of the chains and sprockets were also changed?
P0017 Exhaust Camshaft Position Not Plausible Bank 1 is commonly a bad cam phaser. In the image that is the EX cam on the left of the image as you look at the front of the engine.
However you can test the sensor easily. All 4 are the same part. Remove two sensors and swap them side to side. Still get the P0017? Likely the phaser. Code changes to
P0016 Intake Camshaft Position Not Plausible Bank 1
P0018 Intake Camshaft Position Not Plausible Bank 2
P0019 Exhaust Camshaft Position Not Plausible Bank 2
It's a bad sensor.

Phasers are not interchangeable that way. They are spring loaded, so they lock out at low rpm and then move as the system uses oil pressure to shift the timing. Normally they should all rotate together if you are moving them manually, so I would say it's a bad phaser.