Definitely worth ordering both and trying them, then returning the one that doesn't fit.
Remember that the critical fit component is whether or not the short is stretched enough to keep the pad in the same place regardless of your movements on the bike. If the shorts are too large then the pad will slide around and you'll have issues. I've found most modern bibs have a reasonable amount of give in the straps so a given size will cover a wider range of heights.
I'm willing to bet that you're actually Medium in Rapha and possibly Castelli and the other higher-end brands. For reference, I'm 6'0" and am definitely NOT lanky and I'm a Large in brands like Assos (Mille and RS), alé, and Giordana. If I were similarly thin as the model in that photo I would absolutely be a Medium.
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