So now that you are here, it means you have already read the first Version of Romance Dawn, if not go read that first and then come back here.
Okay So after reading the first version, you must be thinking How awesome it is… All that Luffy wants to be Peace Main concept and Shanks giving him his trademark Strawhat. Yeah It is kind of amazing, But the second version is a little more different from the one you know… In the second version of Romance Dawn which was also released in 1996, The one who gives Luffy the Strawhat is his grandfather Garp, who is also a former Peace Main(Pirate) instead of Shanks. In fact Shanks wasn’t even introduced in the second version because Oda wanted to keep Luffy’s backstory with Shanks a surprise. Also note Luffy doesn’t have a Scar under his eye even in the second version.
But the interesting thing is that Luffy’s grandfather was originally believed to have been solely an addition to this version of “Romance Dawn" in order to keep Luffy’s true back story a secret; no mention had been made of him at all in the first nine years of One Piece’s serialization.Yet in late 2006, Luffy’s grandfather was revealed as none other than the previously-introduced Vice Admiral Garp, bearing the same character design as his “Romance Dawn" predecessor. However, it is unclear how long the author had this in mind, as Garp appeared to be a minor character at best when he was first introduced. It is also worthy of note that, while his personality is the same, his character has changed dramatically: far from being a pirate himself, he is a high-ranking Naval officer, who had hunted down the famed Pirate King on multiple occasions.
Also in this version of Romance Dawn, Garp is the one who motivates Luffy to be a Pirate, pretty contrary to the Garp we know in One Piece.
One more thing to be noted is that All three versions of the storyline have a similar looking female character who appears in the storyline. However, Oda’s final chosen female Nami does not appear in the final version of Romance Dawn and instead appears several chapters later. The first two are Shiruku /Silk (in V.1) and Anne (in V.2).