Combatives is a Mind Set and an Application of Force ,used Offensively over Defensively,meaning when a threat presents its self you attack into the threat,close with the enemy/threat and destroy it/remove it and move on.
RBSD IS NOT the same ,nor is it a guarantee of Combatives qualification as the word DEFENSE used in the description of what you do tells you it is reactionary and defensive rather than realizing the threat and attacking into it using overwhelming force to put and keep the opponent on the defensive and keep them there until they are defeated ,or the threat ended.
Combatives are Reality,but that does not mean the reverse is true.
Many traditional based arts,found more in sport exchanges ,also do not qualify as true combatives.
Many RBSD and traditional arts train in basic martial art skills,punches,kicks ,general fighting and wrestling or grappling.
Training people to be street fighters does not mean it is combatives,as many times the fights are taught to be prolonged exchanges,over quick endings.
Combatives mostly use,but are not limited to, attacks to vital targets over body mass strikes,targeting things like :eyes,throat,neck,ears,bladder,groin,joints.It is meant to end the conflict quickly,no prolonged exchanges.
If you teach to realize a threat,close with the attacker and remove the threat and you do so quickly over prolonged,sport type self defense then you are probably teaching something along the lines of combatives.
The Purists of WWII Combatives use the simplistic 1946 military manuals as the true source of functional ,usable,military ,battlefield H2H.
(as can be seen in some WWI video on you tube,near the end of WWI they wanted another way to deal in trench warfare,and combatives ,similar to WWII training were used for a short period,many of the creators of that were involved in WWII combatives)