Matching colors for video
It appears that BT.709 is a larger standard that includes the sRGB color space as part of what it means.  The Wikipedia article says “based on”, but looking carefully at the chart of numbers, they are identical.  So there is no need to convert from one to the other.

Of the various mixing recipes given (which do not agree with each other), the hex code is said to be for HTML/CSS, so that one I can assume is for the sRGB color space.

I used that value in Premiere in the new Graphics drawing tools, and it looks like the right kind of green.

The green background in the white-on-green EPS file they provide for the logo is not the right green when simply imported into Primere, as I noted.  So I loaded it into Illustrator, turned off the background, and saved as the white logo only.  This I imported into Premiere which I layered over the background color, drawn using Premere’s shape tool.