Understanding Society User Support

Hi,
I'm working on neighbourhood social cohesion as a variable and looking at both Buckner's Neighbourhood Cohesion Instrument (nbrsnci_dv) and the neighbourhood social cohesion (nbrcoh_dv) and I have a few questions.

1. What is the difference that both instruments are measuring that both were included into the survey?

2. In the excerpt on nbrsnci_dv it states:
"Note that Understanding Society includes only one 1 of 4 items mesuring attraction to the neighbourhood (F_SCOPNGBHF), 3 out of 6 items measuring neighbouring (F_SCOPNGBHD F_SCOPNGBHC F_SCOPNGBHH) and 4 out of 9 items measuring psychological sense of community (F_SCOPNGBHG F_SCOPNGBHA F_SCOPNGBHB F_SCOPNGBHE). "

a)the number of items add up to 19 of the 18 questions on Buckner's NCI paper, could you clarify if there was an overlap somewhere?

b)As well, how were the variables were selected from the original instrument so that they best represented each of the 3 categories: Attraction to neighbourhood, psychological sense of community and measuring neighbouring.

3. For the variable nbrcoh_dv:
Neighbourhood Social Cohesion scale using items from the Project on Human Development in Chicago Neighborhoods (PHDCN). In the original instrument by PHDCN, there are 5 questions in the survey -
Social Cohesion (PHDCN)
Q11B this is a close-knit neighborhood
Q11E people are willing to help neighbors
Q11F people don't get along
Q11K people in neighborhood do not share same values
Q11M people in neighborhood can be trusted

as compared to the 4 used by UKHLS, could you clarify how the variables were selected from the original instrument as well?

Thank you for your time.