Re: History of city names
No they are different. Rigveda places saraswati river between Yamuna and the Sutlej rivers. Later vedic texts and even the Mahabharata mentions that the river dried up and the region became a desert . According to Hindu scriptures, a journey was made during the Mahabharata by Balrama along the banks of the Saraswati from Dwarka to Mathura. There were ancient kingdoms too (the era of the Mahajanapads), that lay in parts of north rajasthan; that were named on the saraswati river.
*Researchers believe that upliftment of the Aravallis led to the westward migration of Saraswati River system due to fault-controlled movements. The faults have been and continue to be active, registering various sideways and up–down movements in the geological past. As a consequence, there was uplift and sinking or horizontal (lateral) displacement of the ground. Under such tectonophysiographic upheavals, the rivers and streams were frequently forced to change their courses, sometimes gradually, sometimes abruptly, as seen on satellite images.
Evidence from survey fieldwork and recent satellite imagery have been adduced to suggest that the Ghaggar-Hakra system in the undetermined past had the Sutlej and the Yamuna as tributaries, with the Rann of Kutch as the likely remains of its delta. In this scenario, geological changes diverted the Sutlej towards the Indus and the Yamuna towards the Ganges, following which the river did not have enough water to reach the sea any more and dried up in the Thar desert.
The wide river bed (paleo-channel) of the Ghaggar river suggest that the river once flowed full of water during the great meltdown of the Himalayan Ice Age glaciers, some 10,000 years ago, and that it then continued through the entire region, in the presently dry channel of the Hakra River, possibly emptying into the Rann of Kutch. It supposedly dried up due to the capture of its tributaries by the Indus system and the Yamuna river, and later on, additionally, the loss of water in much of its catchment area due to deforestation and overgrazing. It has been proposed that the Sarasvati of the early Rigveda corresponds to the Ghaggar-Hakra before these changes took place (the “Old Ghaggar”), and the late Vedic end Epic Sarasvati disappearing in the desert to the Ghaggar-Hakra following the diversion of Sutlej and Yamuna.[SUP][24]](Saraswati River - Wikipedia)[/SUP] This is supposed by some to have happened at the latest in 1900 BCE [SUP][25]](Saraswati River - Wikipedia)[/SUP][SUP][26]](Saraswati River - Wikipedia)[/SUP]
(Wikipedia)*