What is the difference in Da of ESI analytes with multiple charges? This is a follow-up question to Why are isotopes an issue in reading mass spectra?

A follow-up question: electrospray ionization (ESI) produces multiply charged species and charge can be >40 (for the purposes of m/z ratio), and assuming the difference in mass for an isotope is ~1 Da (with each additional neutron for an analyte at a charge of +1 in positive ionization mode) and assuming there is only one additional isotope, would the difference in weight for two isotopes each with a charge +10 be 0.1 Da?
More realistically if you have a molecule with Br, then the distance between isotopes:


Will be 2 $m/z$ units in case of 1 charge
And 1 $m/z$ units in case of 2 charges


You can use this information to determine if there are molecules ionized twice — their isotopes appear closer than expected. 

Eventually since ESI/APCI adds $\ce{H+}$ for each charge, given original EMW was 100 Da, then:


$m/z$ in case of 1 charge: $(100+1)/1=101$ and $(102+1)/1=103$
$m/z$ in case of 2 charges: $(100+2)/2=51$ and $(102+2)/2=52$


Or in case of negative ionization you'll need to subtract 1 and 2 Da, respectively.