"by almost the same" is correct and usable in written English.
For example, you could use it a sentence like, "The two products are similar, but differ by almost the same degree."
Bottled water sales increased by almost the same amount.
Barrett, after all, has been confirmed by almost the same Senate we have today.
Senator Kerry won the state by almost the same margin Vice President Al Gore had four years earlier.
Black voters plumped for him by almost the same dizzying margin as they did last time: 93% to 6%.
So now you have a feeling for at least two different kinds of processes that can be evolved by almost the same program.
That statement sent Treasury bond yields up by almost the same amount they dropped on Thursday, a gyration that mirrored the conflicting interpretations among analysts about Fed intentions.
The high spectral resolution and the rigorous calibration methods enable accurate estimation of SIF in physical units by exploiting almost the same retrieval concept as that of the European Space Agency FLuorescence EXplorer mission.
It is observed that both adaptive and fixed feedback rate user selection algorithms achieve almost the full fairness by providing almost the same sum rate performance as shown in Figure2.
During 1982 , 1993 and 2004, birth-cohort studies were started in Pelotas, Southern Brazil, with primary data collection at all maternity hospitals of the city by using almost the same methodology.
The SNP vote is up by almost exactly the same across the piece, which suggests that the national polls are right.
Mr. Morse lost his recall by 343 votes — almost the same margin by which he had eked out re-election in 2010.
