Of-course both are same & originated from Vishwakarma Ji & by work are carpenter. Other same surnames name differently area wise are as below:
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Yes whenever a dhiman adopt sikhism he is considered as ramgarhia.Both castes are same.
Majority of Parkar (Hindu - Maharashtra and Goa) surname is from Bhandari Caste. Vaishya Vani caste too have same surname but it is rare.
Manra is a jhangi caste.
The Caste System does not allow someone born into a lower caste to change their economic standing. Also, you must marry within your caste so there is no way to marry into a better caste.
Surname was established for kallar community to understand about their relations with each other in same caste