Hmmm would you mind sharing a bit more on it...I know its a naive example however there is a market and if am hooked up into a loan with Bank A i am free to go to Bank B and refinance my loan where Bank B will give me the outstanding loan amount which i will use to pay bank Bank A....is it not possible??
Firstly, it is yet unclear as to what parameters will be actually used by AIIB to give loans. Secondly, last I knew, the US, Japan and Canada had not joined. AIIB will be in contest with IMF and World Bank to capture the third world bailout market. Currently Pakistan is an IMF client in this regard. Naturally, the chances of cooperation such as what you are suggesting between AIIB and IMF are nonexistent.
AIIB is meant to provide an alternative to the Washinton consensus, which is the reform package that comes as additional baggage with any bailout program for an economy in crisis. Under this package, governments are told to cut spending (which usually happens in education, government jobs and healthcare), reduce the fiscal deficit, open domestic markets to imports, devalue the currency (usually) to promote exports, and so on. This is called "structural adjustment" in economics. This term has become a deeply hated term in developing countries. There is a near uniform consensus among developing countries that the IMF/World Bank enforced "structural adjustment" severely destabilizes their economies.
AIIB has, currently, a much narrower mandate - to foster long-term economic growth through investment in infrasructure projects. The Chinese government is sure that their "growth through infrastructure investment" model works, and they are now looking for clients. So, really, they are two different routes, and there is little convergence between them. The Asian Development Bank, which was modeled closely on the World Bank, is the immediate rival to AIIB. After it supersedes ADB, the AIIB can look to take on IMF/World Bank.