I guess you'd also need to compare materials. I believe LDB are full titanium so if Danmoto are titanium then OK to compare costs, but be sure they're all titanium incl. the perforated tube inside, like the LDB's, not just the sleeve.
There are usually differences such as these & others which make quality more expensive than budget stuff. If you don't drop the bike, but the Danmoto cans come apart after a while, or need re-packing earlier will it have been worth the saving?
As for your original question, no I don't think like for like diameters of silencer (Inner & outer) are going to be much different in power output. You might find it easier to locate a PCIII USB map for the LDB's than the Danmotos though...
Euro RC51 SP2: HRC WSB Ti Hi-Level, T1 Airbox & Snorkel, PCIII, Dymag CA5 Carbon Wheels, Ti64 Spindles (F, R & Swing Arm), Mori Link, Maxton GP7 Shock & Ohlins 832 Forks, Brembo GP Calipers & SBK narrow track (F), Braketech Disc (R), Brembo billet Underslung x 2 Brembo RCS, Tyga Triple, 7075 Stem, Probolt Titanium all over, Babyface rearsets, MR Complete Carbon Lineup, Custom Undertail & CBR 1000 LED, Watsen LED Indicators, Harris Brace, Giles clip-ons, Corbin seat, etc. 2013 BOTY.