does it matter if RTA is set to SPL or dBFS when measuring frequency response?

[Socket]

Sorry for another newbie question
I am using the RTA function in REW to measure the frequency response of the speakers in my car
I have always had the RTA graph set to SPL
Someone suggested the RTA graph should be set to dB more specifically dBFS
Which is correct? Does it really matter and if so why?
Thanking you in advance

 

[John Mulcahy]

No, it doesn't matter. The shape of the response will be the same.

 

[Socket]

Thanks John, you are a genius

 

[w_sizer]

No, it doesn't matter. The shape of the response will be the same.

Thanks, I had the exact same question!