How much does heigh/back length matter?

I have found a great deal for Lowe Alpine Sirac Plus 50L - new for 75€. The thing is it's not the L/XL version and the available model has back length 48-53 cm. I am 195 cm tall. I tried to measure my torso and it was 53cm (I was doing it alone so maybe the precision isn't that good).

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Should I risk it?