NIST data changes between 1.14.9 to 1.19.3

[kesara]

When updating relaton-nist from 1.14.9 to 1.19.3, I noticed several differences in Relaton data.

For example: NBS_SP_500-94 gets the following changes:

2c2
< schema-version: v1.2.3
---
> schema-version: v1.2.9
10a11
>   type: main
14,15d14
< - content: https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nbsspecialpublication500-94.pdf
<   type: pdf
24c23
< - type: published
---
> - type: issued
29,37c28,29
<       given:
<         forename:
<         - content: Albrecht J
<           language:
<           - en
<           script:
<           - Latn
<       surname:
<         content: Neumann
---
>       completename:
>         content: Neumann, Albrecht J.
40,41c32,34
<         script:
<         - Latn
---
>     identifier:
>     - type: uri
>       id: https://id.loc.gov/authorities/names/n82058849
46,53c39,43
<     - content: National Bureau of Standards
<     abbreviation:
<       content: NBS
<     contact:
<     - address:
<         city: Gaithersburg
<         state: MD
<         country: US
---
>     - content: United States.
>     - content: National Bureau of Standards.
>     identifier:
>     - type: uri
>       id: https://id.loc.gov/authorities/names/n79021148
56,60d45
< revdate: '1982'
< language:
< - en
< script:
< - Latn
63c48
<     content: NBS Special Publications (General)
---
>     content: NBS special publication; NBS special pub; NBS SP
65,66d49
<   abbreviation:
<     content: SP
69,70c52,57
< - Gaithersburg, MD
< doctype: standard
---
> - city: Gaithersburg
>   region:
>   - name: Maryland
>     iso: MD
> doctype:
>   type: standard

Are those changes caused by NIST sources or from relation-nist gem?