Yup, it's definitely Cardcaptor Sakura meets Nanoha.
I've renamed this thread to focus on T.P. Sakura. If people want to discuss the D.C. ext OVA that comes with the PSP game, then I guess we can create a new thread for it (though it really is more of a bonus disc, since it just animates a few confession scenes from the game; not really a full standalone work, unlike this one).