Yeah, Nordica went through some interesting interactions when they decided to put "race boots" in the hands of retailers. Probably the best and smartest move and a good boot for the masses was the Dobermann Pro 130. It was about a 130 Flex, and had a 95mm last in the reference boot size. Liner was "OK". Many ended up with lace up liners in them. It was NOT their full on Dobermann, and not a race boot. My son was a comp'd athlete in the matte black boot, and I scored a pair of the Pro's. Good boot for me for many years.
The Matte Black boot pretty much went away. They may have moulded it in the old plastic, but I know guys who were skiing at the WC level who were in the same boot, new glossy plastic, and didn't think it was the same. It didn't time the same. That started the bring back the matte black requests. That original, "real" Dobie is the class 92mm boot. Much imitated. Used by many "undercover." It's been back for about 6 seasons with both a Nordica and Tecnica brand. It's also now made in a variety of flexes and a wide range of sizes. Serves a LOT of people. Stiffest one that I have seen was stamped "180", and I'm not sure that it did the racer any favors.
So, going from memory, or misery, around 2005, Nordica rolled out some interesting Dobermann boots. We had the boot with the abducted stance, "the aggressor." I recall hearing of people trying the boot in NZ and raving about "how great it felt, and how slow it timed." Depending on your needs and goals, it could be a good boot. My son experimented with them, as did many other guys for a whole month in Chile, as there was thought that softened they could be killer speed boots. Macro Sullivan used them for a very short while. Then back to the straight last {much like the Fischer guys}.
The 'EDT" experiment was a really strange gimmick. Hey, it's marketing. If we're selling "race boots" through dealers, let's do something new. This metal plate below the zeppa will really strengthen the boot sole. Yeah. Frostbite City. There were some older kids in the East who were not in the pipeline to get the now "older" straight last boot, and tried to ski in those things. Nothing better than being at a place like Whiteface in January with those things. Ugh. Then they moved to the composite plate {or whatever it was called} and my understanding was the general consensus was that it did nothing. Meanwhile Atomic was killing it with the white boot, Lange was doing just fine, etc. Head had the boot rolled out.
That around 2011 led to the demand to please bring back the matte black boot. We don't care what you call it. Bring it back in terms of availability, and they did. If the boots fit your foot, hard to do much better. And there is a lot to work with there. The boots ca be made to fit many feet. A lot of people affiliated with Nordica on the race side feel that they could have saved a lot of money and time if they had just stuck with the matte black "original" Dobie. You can't imagine how many nearly brand new boots we pitched into a dumpster.
Meanwhile our daughter was in a Lange plug for 12 years. Boots had very little change year to year, and worked for her.
@ScotsSkier is right on the money. The baby blue boot was similar, with some tweaks. The material of the race boots was a bit different. Took some tweaking to get flex dialed. They also seemed to be more prone to cracking, at last among our friends. When they went back to the darker blue, guessing around 2010, I'm pretty sure that the molds were the original design and the shape was identical between Rossi and Lange. The material, according to those who can actually feel it {and for whom it matters} is not. The Rossi is generally acknowledged to be a bit softer in the ZA, ZB boots. Rossi clearly makes some very stiff boots and there are plenty on the WC. But we also see some Rossi skiers who prefer the blue boot. Not sure if Rossi would admit, publicly, that there's a difference. Publicly.
All personal preference.
I ski in a LV RX130 these days. It's the same exact shell design as the RS130. Mine are a few years old. They are softer, for sure. Not by a lot. I asked my boot guy which I should go with {we go back 20+ years} and his response was "I went green as it looks cooler according to my six year old......" Sound advice. I went green. Then threw out the liners......