Yeah it seems unreasonable to me that the Defiant and Enterprise D wouldn’t have totally different size Jeffries tubes considering how different in scale and function the two ships are.
The LD version seems plausibly the same dimensions as the second pic, if you notice how Tendi appears to be positioned lengthwise under Rutherford’s back. Assuming that Tendi and Rutherford are both smaller than Riker, which seems to be the case.