Two blond men

There are two blond men now, on the Alidivento and even though, technically, the comic would be considered in color (by publishers and printers) it's... still monochromatic.

So this is how you tell the difference between Martin and Westley, because they are not basically  identical (particularly now that Wes' hair is growing back) but they are very similar in tone.

In case you still have problem you might start by a simple question: how tall is the girl while standing next to him? Well, if she reaches his shoulder then the guy is Westley. If all she sees are nipples (XD) then the guy is Martin.