If a Data Model is being fed by a tag and the data that is tagged belongs to a single sourcetype, does the data model have to be rebuilt if an additional sourcetype is tagged in the same way?

We have an accelerated Data Model in which data is being supplied by a tag. This tag includes a set of data within a single source-type. We now have a separate set of data with a majority of its fields that are similar. If we tag the 2nd source-type using the same tag as the first subset, will the Data Model have to be rebuilt? Additionally, what kind of issues might arise from such a situation?