Please take a look here:
As you can see in this image, whether you use the orange notation (pin
15) or the blue notation (pin
1), it doesn't matter as long as you set the up the
In the image you can see that port
A0 all the way up through
A2 have multiple functionalities.
Also, if you take a look at the ports arrangement, you'll see that any two analog ports share one common pin except for
A2 ports. So, you are only capable of using 2 high-temperature sensors because each of them need 2 analog input pins.
pinMode(14, 'INPUT') is the same as
pinMode(14, 'OUTPUT') is the same as
This is analogous for all other pins.
Here's a link which can thoroughly describe the hardware ports.