Having separte Apple accounts on same device
When you change countries, you will no longer receive app update notifications on your iOS device or in iTunes for the apps you purchased in your original country. 

However, you will still be able to download those applications again for free if they are present on your new country's store (even if they are updated). 

You will not be charged and the download will not appear on your Purchased page. 

If the app is not available in your new country, you will not be able to download it again.