Tout a fait. I use to poke that Breguet somewhat invented Dassault's Mirage F1 eight years in advance.
Unfortunately the French Navy prefered buying 42 Crusaders instead...
There's a great TL that remain to be made on the Breguet 1120 Sirocco, by the way.
Not only was that project a Mirage F1 before its time (I did this picture a while back - the two are stunningly similar, and there are excellent reasons for that, since both were designed as a mach 2 atar powered swept wings interceptor with side-mounted air intakes - how could they be differents ?? it's like Spitfire and Me 109 !)
It could also have been the basis of of a cooperative naval fighter between France and Great Britain. sounds familiar ?
The Jaguar started as the Breguet 121... Br.1210 in fact, so not too far down the legacy of the Sirocco.
Now imagine. The year is 1958. The Saunder Roe naval fighter is dead, but the RN still need an interceptor. The French Navy for its part is comissionning the Clemenceau in 1960 with... Etendard IV for fleet defence (no joking: that was the original plan before the Crusaders !).
OTL the Crusader deal was a difficult one; in fact the French Navy had to bargain the Crusaders against a Suffren class air defense frigate.
But what if the French Navy instead proposed the Breguet 1120 as a joint UK-France project, Jaguar-style ?
Not only would that cooperative effort kill the Jaguar down the line (why starting another Anglo-French combat aircraft in 1965 then ?)
Another sweet irony would be the fate of the Mirage F1.
The F1 was the 1968 end result of the Armée de l'Air failed VSTOL / STOL five-year massive effort that included VTOL, swept wings, and VG Mirages.
Quite inevitably had Breguet managed to sold the Sirocco to both Great Britain and the French Navy they would propose a land-based Sirocco as an alternative to the F1.
The great irony is that OTL Dassault bought Breguet in 1967 and inherited from the Jaguar... an aircraft they hated because they felt it threatened export sales of the F1, at least in the ground attack role. So Dassault actively sabotaged development of the Jaguar; that's the reason why the French Jaguar avionic suit was always pathetic when compared to the British one. Dassault kept the Jaguar as a rugged bomb truck with all the sophistication going into the Mirage F1s - see the South African or, even better, the Iraqi F1EQ that were far more powerful than even the French ones.
Oh, and there might a perfect fitting, anglo-french name for the Breguet 1120 (same as Jaguar or Concord(e) or Lynx): CYCLONE.