Sanity check, ITU and IEC definitions of sRG are identical, right?

Learned people,

Currently, all W3C specifications (bar one, which is being fixed [1]) 
refer to the IEC definition of sRGB as authoritative. [2]

Multimedia systems and equipment - Colour measurement and management - 
Part 2-1: Colour management - Default RGB colour space - sRGB 
<https://webstore.iec.ch/publication/6169>.

However, the link goes to the IEC web store[3], where one can pay real 
money for a copy. In consequence, many people don't have a copy 
(including myself, hence this mail).

I recently learned [4] (and sorry, I didn't know this before) that sRGB 
is also defined by the ITU, on p.14 of:

Television colorimetry elements. Report  ITU-R  BT.2380-2 (10/2018)
https://www.itu.int/dms_pub/itu-r/opb/rep/R-REP-BT.2380-2-2018-PDF-E.pdf

and this specification has the merit of being freely available to download.

I see that the ITU report does reference IEC 61966-2-1 so I presume that 
the chromaticity coordinates, EOTF and OETF are copied correctly from there.

I notice that the EOTF breakpoint is specified to more significant 
figures, 0.40449936 rather than 0.04045 which I have seen elsewhere.

I would have greater peace of mind, before submitting a pull request on 
the spec database to point to the freely available specification, if 
someone who has read /both /specifications could confirm for me that the 
definitions are identical?

[1] Web Content Accessibility Guidelines refers to an obsolete 4th 
working draft of the IEC specification, which still has the erroneous 
rounded-off coefficient that led to a discontinuity in the transfer 
function.
Although the impact on 8bit per component systems is invisible, I now 
have agreement to fix that
https://github.com/w3c/wcag/issues/360#issuecomment-453741912 and following
[2] https://www.specref.org/?q=srgb
[3]  https://webstore.iec.ch/publication/6169
[4] https://github.com/w3c/wcag/issues/360#issuecomment-487476773

-- 
Chris Lilley
@svgeesus
Technical Director @ W3C
W3C Strategy Team, Core Web Design
W3C Architecture & Technology Team, Core Web & Media