They are said to have the same preamps. I'd look into the power supply thing though, which I think most people underestimate when you talk differences between the two:
"DL153, 151, 251" - 96k or 48k, Midas Pro Preamps, Redundant power supply WITH FILTERING, fan cooling with a little noise
"DL16, 32" - 48k, Midas Pro Preamps, Regular Power supply, no fan no noise
Even if a preamp is manufactured and engineered well, the power supply and its CMRR can make a noticable difference. The DIRTIER the 120/240V coming out of the wall, the bigger and more apparent the sound difference should be.
This is one of the reasons the big pros always go intensely for thorough filtering on the power supplies of their audio equipment.
There's an austrian engineer, who compared the "M32R" to the "DL153". To some, the quality difference is apparent, others just can't hear it. What I might also add to this, is that german and austrian in-house 240V power, if it isn't a 300-year-old house out in the countryside, will be alot cleaner than your typical american or british power. So the difference he is showing, certainly isn't the maximum effect:
https://hannesmottl.wordpress.com/2016/04/10/midas-m32-vs-dl153-stagebox/
There's obviously also the comparison video on YT between Behringer X preamps and Midas M preamps. I'd say the difference is extremely apparent, even on phone or laptop speakers. This difference is not just down to power supply differences: