This actually is handled automatically by the 'fremantle' distribution name. Your repository all point to this distribution, which might be handled by HildonApplicationManager, FasterApplicationManager or pure apt-get, which are the recommended ways to install applications.

But you have to be careful about manually downloaded package to be installed by dpkg. Dpkg is the low-level installer, which does what it is been told to do without much checking for dependencies or breakage.