Is this the duude?(:?

I was out on a boat the other day and went to a boat stop called marker 37 and there me and this guy we had no idea who each other was but we looked at each other and then he ripped his shirt off and at the time he was on his boat and i was on mine. but then wen we got off our boats to go inside he had to go and i nvr got his name/number. well earlier this morning i found a guy on facebook who looked EXACTLY like him. i mean the hair and body. so i friended him and he excepted it. but idk how to ask him if he was the guy at the boat stop with out sounding weird or like a stalker. please help me i have no clue how to ask him. all answer are greatly appriciated(: thanks soooo much!