Yes, it's in no way critical, either 10pF or 47pF should work fine - as it's a higher frequency crystal I'd probably go with 10pF myself given those choices.
No, they are an essential part of the oscillator circuit.
Yes, it's in no way critical, either 10pF or 47pF should work fine - as it's a higher frequency crystal I'd probably go with 10pF myself given those choices.