Apart from the transmission engine block itself is modified for swift. Even the URVU or whatever its called isn't trouble free; there's a reason Liana 2007 is cheaper than Baleno 2005...
Swift is 1328cc
Liana is 1323cc
Welcome to official Web Portal of Excise Department, Government of Sindh
Put registration numbers of Swift & Liana here & see for yourself.
@The topic poster; I offered my sincere advise based on my experience of using different cars on daily basis now its your choice as what you wish to buy with your money, I wish you all the best and if you need any further help please feel free to inbox me. I won't comment on this topic any further because nothing is foolproof to a sufficiently talented fool.