I have two applications designed for the same users and providing similar content, but they are data incompatible. Existing users of the old app have active subscriptions, and I would like to enable them to use this subscription for the new app as well.

I have two applications designed for the same users and providing similar content, but they are data incompatible. Existing users of the old app have active subscriptions, and I would like to enable them to use this subscription for the new app as well.