Not necessarily. Dragonball Z is mistakenly cropped here in the US, and the in-house remaster by FUNimation reveals a little extra information on the side. It's nowhere near enough to warrant the decision, but it's there. Looks like open-matte framing often is the same.
For a more relevant version, see Harry Potter and the Sorcerer's Stone. Regardless of what version you choose, something's always cropped.