Yeah Tomar and Tanwar are used interchangeably but IMO most of the gujjars use Tanwar and rajputs use Tomar.
Tomar are mostly from Up side AFAIK ?
Actually one of my gujjar associate told me that Tanwar gujjars settled in Delhi some 500 years ago from Rajasthan. Most of the 'villages' in Delhi are dominated by either Jaats or Tanwar gujjars.
Reason for Delhi/NCR having Tomars/Tanwars in Jats or Rajputs or Gurjars is that dynasties like that of Anangpal Tomar ruled in Delhi/NCR region even before Chauhans came in. You would also find lot of Chauhans in Delhi/NCR, although their capital was Ajmer.
Actually in Rajasthan we even have a Rajput clan/branch called BarGurjars.
As per the Sikarwar Khyat, an offshoot of these BarGurjars called 'Sikarwar' Rajputs had laid a successful cavalry attack on Babur while his army was on move from Sikri village to Kanhua. This was done to facilitate the others enough opportunity in retreating and escaping Babur's wrath.
The leader Dham Dev Rao Sikarwar was a friend of Sanga and had also helped in taking heavily wounded Sanga away to safety after the main battle.
Regards,
Virendra