You got me thinking on that on! I do not know.
Pink Glow is a synonym for Dolgo (according to Mr Habibi @ Keepers).
As for it being a M. pumilla, I note that online RHS plant finder its
listing for it don't go down to the species, just cultivar. (
http://www.rhs.org.uk/RHSPLANTFINDER....asp?ID=169623 )

How is that for a non answer!

Regards

Clifford
Bawtry, Doncaster, South Yorkshire