What is the meaning of the underlined part
There is a spike in the mails since the re-election of Narendra Modi and his supporters pitching him for the primeministership. At some level, all these letters share the opinion that one who has got the electoral approval is beyond criticism, and that this newspaper is not accepting the electoral verdict as the ultimate truth.I am disturbed by the tone, tenor and the general thrust of these letters as they try to reconstruct India as a homogenous entity obliterating its multiplicities, its natural treasure called its diversities and heterogeneities. At one level, these voices say that they are not bothered about what the world thinks of them and cloak a form of xenophobia.
Can 'at some level' and 'at one level' be used interchangeably? Or is there a difference between them?