VeraCrypt has a hidden volume mode where an inner encrypted volume is stored within the contents of an outer hidden volume, and the inner volume is indistinguishable from random data when the outer volume is decrypted for plausible deniability.
If the format schemes are indistinguishable that's good news.
If it is indistinguishable then you run the risk of losing data in the nested container if you copy enough data (accidentally) on the outer container.
Not sure which is the case with veracrypt though.