Agreed, i assume theres "some" resemblance since Scotch seems to make the connection but we'll see. Regardless im not convinced theres any malevolence from Shanks because of this at this point, obviously given his twin exists. If he's still casually talking to Scopper with that tatoo, then evidently there was some mutual understanding between him and Rogers crew.
If I had to guess, after Roger found one piece, he told him to go home and find out more about his past, provided they found out about Imu through the Void Century info.
All in all hopefully it gives him some depth beyond all the mystery shit lol