Need to merge two repos

i need to merge two repos which are in two different svn servers.

same project is in both srvers but with different revision numbers. in svn server A , the head revison is 150, and in svn server B, the head revison is 180.

From revison 0 to 140 in server A and server B is same. From 141 to 150 in server A, from 141 to 180 in server B is differnet.

Now i need to the chages in server A also be moved to server B


Any suggestioins please.