Greetings,

HenrikOlsson and tumbleweed thank you so much for your help.

I think I have a better understanding of these settings with your help.
I also found this:
8-bit PIC® MCU Clock Switching - Developer Help (microchip.com)

In there they also say

Code:
When the SCS bits = 00, the system clock is switched to the clock source selected by the Fosc bits in the Configuration Register. This can be the Internal Oscillator, External Crystal/Resonator, or External Clock.When the SCS bits = 01, the system clock is switched to the Secondary Oscillator which is an external 32.768 Khz crystal that controls the Timer1 Peripheral. The external clock crystal is an optional clock source that must be part of the Timer1 design circuit.
When the SCS bits = 10 or 11, then the system clock is switched to the Internal Oscillator independent of the Fosc configuration bit settings. The IRCF bits of the OSCCON register will select the internal oscillator frequency.
This makes me believe that, if we have the internal osc setup in the FOSC<2:0>, the result will be the same if I select any of the 2 options:

"1x = Internal oscillator block" or "00 = Primary oscillator"

Am I right?